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Asia Noise News

Royal Thai Airforce training to move due to noise complaints

Udon Thani: Relief measures including a plan to move a training base for the Thai and Singaporean air force F-16 fighter crew to Nam Phong airbase in Khon Kaen province in the next 3-4 years is being drawn up.

The move is to help locals living in the vicinity of the Royal Thai Air Force (RTAF)’s airbase in Udon Thani who have complained about aircraft noise, a seminar was told on Friday.

Authorities from the House Committee on Foreign Affairs, the RTAF, the Ministry of Natural Resources and Environment, and locals were invited to the city meeting to discuss a recent rise in noise pollution, particularly during take-off and landing.

Gp Capt Wisarut Chanthapradit, commander of the RTAF’s 23rd air wing, said nobody was sitting idly by following complaints from those affected in the northeastern province.

Plans to move the Thai and Singaporean air force facility to Nam Phong district in Khon Kaen province in the next 3-4 years are already advancing at pace.

Gp Capt Wisarut said that normally only four fighter jets would be in service at this time of the year; there were already a total of 12 jets involved in this year’s specially arranged joint training.

Sarawut Petchpanomporn, Pheu Thai MP for Udon Thani and president of the House committee, said it was a second trip for members to verify the credibility of the complaints following an earlier visit.

While cautiously welcoming the decision to relocate, Mr Sarawut also called on the combined force to offer aid to those affected by the extra air traffic.

Sayan Meekaew, chief of the environment quality control division of the Environment Office, said harmful noise levels had been recorded in three areas and hoped the RTAF would help pay for treatment for locals.

It is unclear how much the relocation would cost.

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Asia Noise News

Singapore: Woman who suffered through noise from upstairs neighbors lost sleep, job

After tolerating what she claimed were sounds of dragging furniture and children running and jumping from her neighbour upstairs for about three years, her health deteriorated from being sleep-deprived and she had to stop working for six months.

The customer service officer, who wanted to be known only as Jessie, 37, told The Straits Times that she decided to give up and fork out $1,200 to rent a bedroom in a landed house elsewhere with her husband last month, as she could not take it anymore.

“Spending the money is worth it as it buys me peace. I can now sleep properly, my blood pressure has gotten better, and I can focus on my job now,” she said.

Jessie, who still owns her Housing Board flat in Yishun, took her case to the Community Disputes Resolution Tribunal (CDRT) in July 2020 after three failed attempts at mediation through the Community Mediation Centre (CMC).

She claimed her neighbours quietened down for about three weeks after the session, before the noise started to pick up again.

Jessie’s case was among 221 applications that were filed with the CDRT in 2020. There were 237 applications in 2021, Minister for Home Affairs and Law K. Shanmugam said in response to a parliamentary question on Feb. 18.

HDB has also seen an uptick in feedback relating to noise from residents’ activities, including renovation noise.

Such cases went up by about 25% to 3,200 cases a month in 2021, compared with 2,500 cases a month in 2020.

This is likely due to work from home arrangements, coupled with the resumption of renovation activity in June 2020, said National Development Minister Desmond Lee in response to a parliamentary question on Feb. 14.

Jessie, who worked in an office, claimed the noises from her neighbour’s young children would get worse after 10 p.m. and carried on until past midnight. When it stopped, noises from pushing furniture would begin.

The distress from not being able to sleep affected her at work.

 

She said: “I’d go to work and sleep in the office. I got quick-tempered, I started to scold customers and cry at work — I couldn’t control myself. I never behaved like that before, and it scared me.

“I couldn’t go on like this any longer and I left my job.”

Affecting mental health Annabelle Chow, principal clinical psychologist at Annabelle Psychology, said noise disturbances could result in poor quality fragmented sleep — when a person wakes up several times a night — and could affect their mental well-being.

“It increases daytime sleepiness, tiredness, annoyance, mood changes, and decreases cognitive performance,” she said.

Jessie was also prescribed medication — sleeping pills, antidepressants and propranolol, a medicine that treats high blood pressure, anxiety, and migraines.

Adrian Wang, a psychiatrist who runs his own practice at Gleneagles Medical Center, said that prescribing medication like antidepressants is common to regulate anxiety while patients look for a longer-term solution.

“Mental health is tied to physical health. If your sleep is poor and stress levels are high, it affects your blood pressure, digestive processes, and can cause tension, headaches, or anxiety attacks,” he added.

Jessie landed a job in the same line, which she started when she moved out last month. She and her husband are also in the process of selecting a build-to-order flat, which they applied for last November.

She said of her Yishun flat: “I thought this would be our ‘forever home,’ after renting for about three years before moving in. I love this unit, and I’m sad I’ll have to let it go.”

HDB advises those facing neighbour disputes to “communicate with your neighbours politely, listen to them and be willing to compromise” before seeking mediation services, according to its website.

The current quiet hours — where residents are advised to keep their volume levels low and avoid carrying out drilling and hammering works are between 10:30 p.m. and 7 a.m.

A private tuition teacher who wanted to be known only as Ng, 47, said she was polite when she approached her neighbour upstairs to tell them about the alleged heavy footsteps and dragging noises she heard.

“They said I was crazy and shut the door,” she said, adding that the noise, which occurs in the day, was disruptive.

But Ng is hesitant to apply for mediation through the CMC or CDRT.

“To bring the matter up to that level, wouldn’t it strain relations? It’s a last resort and I doubt the chances of an effective resolution,” she said. “I’ll just tolerate it.”

But in another case, Madam Chia, 46, said that bringing her issue to CDRT was the only avenue she had, as her neighbour upstairs refused to attend mediation and was adamant the stomping and running noises she allegedly heard did not come from their children.

“The neighbour even posted on our estate’s Facebook group that they were the ones being harassed,” the customer service officer added. The proceedings are still ongoing.

Wang advised people enduring noisy neighbours to explain the situation calmly to them.

“If the problem is not solved, seek help from authorities to mediate – don’t take matters into your own hands,” he said.

Singapore noise nuisance
Singapore noise nuisance

In a letter to ST’s Forum page published on Feb. 21, an ST reader suggested a demerit system for recalcitrant noisy neighbours where HDB compiles complaints from residents about a specific unit.

HDB should issue the unit a warning letter when the complaints reach a certain number, the reader said, adding that the number of warning letters should be considered when the noisemaker applies for another flat or for services under HDB.

In the United Kingdom, noisy residents can be issued a noise abatement order. If they break the order, they can be fined up to £5,000 (S$9,000).

But criminal lawyer Amolat Singh said the demerit system is not workable as it may punish innocent residents living in the same home.

“If it’s up to the number of complaints, there is no avenue for a person to clear their name,” he said.

Singh noted that offenders who contravenes a Magistrate’s Court order to abate the nuisance can face a fine of up to $2,000 under the Miscellaneous Offences (Public Order and Nuisance) Act, but these are extreme cases.

“The remedy lies in educating people. We are a very densely populated country, and we must be a bit more sensitive,” he added.

Still, Jessie hopes more can be done.

She said: “There are many people who are in the same situation I was in, and we complain and give advice to each other on social media.

“Others may not have the means to move out like I did, so I really hope the Government can do more about this. 

Source

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Asia Noise News Environment

Korea: Residents of Pyeongtaek to Receive Compensation for Military Noise Pollution

PYEONGTAEK, Jan. 3 (Korea Bizwire)

About 63,000 residents of Pyeongtaek will receive monthly compensation for noise pollution coming from a military airport in the city, officials said Monday.

According to the government of Pyeongtaek, a city about 70 kilometers south of Seoul, the residents of 10 administrative units, including Sinjang and Paengseong districts, will receive monthly compensation from August under the military noise pollution compensation act which took effect last year.

compensation for aircraft noise korea
compensation for aircraft noise korea

South Koreans and foreigners who have been registered as residents of the districts between Nov. 27, 2020, and Dec. 31, 2021, are eligible for compensation application.

A monthly settlement of 60,000 won (US$50.30) will be provided per resident living in an area suffering noise pollution of 95 wecpnl or higher, 45,000 won for pollution of between 90 wecpnl and 95 wecpnl and 30,000 won for pollution of between 80 wecpnl and 90 wecpnl.

Wecpnl is a comprehensive unit measuring aircraft noise levels.

The city’s deliberation committee will review the applications and deliver the results by May, officials said.

source

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Environment

George Town Malaysia: Factory buses causing noise, complain residents

Factory buses causing noise, complain residents

GEORGE TOWN: Residents in the Relau neighbourhood in Paya Terubong, Penang, are upset over the noise pollution caused by factory buses.

They said this problem had been going on for more than 10 years with the authorities not taking any remedial measures.

Relau is a mixed neighbourhood, where low-cost flats exist together with expensive properties.

The problem began when some of these low-cost flats were turned into hostels for foreigners working in factories in the Bayan Lepas Free Industrial Zone.

Factory buses often enter the neighbourhood to pick and drop these workers.

At a press conference today at the Sierra East condominium, the Penang Relau Residents Association said the driving habits of these bus drivers also endangered the lives of residents.

“The roads in the neighbourhood are narrow and these buses are too big.

“Some of our residents have experienced close calls with these buses almost hitting their cars at T- junctions,” said Keane Ng, representative of the Penang Relau Residents Association who chaired the session.

He said there was noise pollution when the bus drivers started to park their buses along the roads.

“They start their engines as early at 4am,” said Ng.

He said the parked buses caused traffic congestion.

Ng said the noise pollution and the hostels for foreign workers had led to a depreciation in the value of their properties.

Ng called on the Association of Companies in Penang Industrial Zone (Frepenca) to resolve the problem by designating special parking depots for the buses that are located far from their neighbourhood.

factory buses cause noise nuisance george town malaysia

He said Paya Terubong assemblyman Yeoh Soon Hin had promised to find a solution to their woes by introducing road bumps and height gantries.

“We have also raised this matter with chief minister Chow Kon Yeow.”

Back in 2018, The Star reported that the Penang state government had identified two sites in Bayan Lepas as factory bus depots.

Earlier in February, factory bus operators said the lack of such depots had forced them to park in residential areas.

Source

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Environment Uncategorized

Noise complaints lead to drug bust in Thailand

You can make some noise, or you can break some laws, but you should avoid doing both. After neighbours complained of a Pathum Thani condo in a luxury building making excessive noise, police checked it out and uncovered a drug-dealing operation. The investigation led to several arrests.

The Department Of Provincial Administration joined the district chief of Klong Luang in Pathum Thani to investigate the noise complaint and ended up setting up a sting operation that culminated in a drug bust instead of just a noise violation.

noise complaints lead to drug bust Thailand
noise complaints lead to drug bust Thailand

The sting offered a low-level drug deal of just 500 baht and ensnared a 26-year-old Thai man and a 24-year-old Thai man who was a fourth-year university student. The Pathum Thani bust recovered the 500 baht from the drug deal as well as 2 full marijuana plants and imported heads for growing, weighing just over 46 grams. Other paraphernalia and evidence was seized too.

The raid was a small one, but police leveraged the young dealers to try to climb up the supply chain for a more significant bust. The 2 small-time dealers rolled over on another location in Pathum Thani just a few kilometres where police encountered 4 people doing drugs.

Police found and seized 514 grams of compressed marijuana on the premise in the second bust. They also made 2 more arrests related to the case including following the trail from the busts to locate and arrest a drug runner who was stopped in the middle of a delivery. He had 182 grams of marijuana on him.

The man claimed that he had no idea that the parcels he was delivering contained illegal drugs, saying that a woman who looked like a normal vendor told him he was just delivering cakes, for which he was paid a mere 280 baht.

Source

 

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Asia Noise News Building Accoustics Building Acoustics Environment Home Noise and Vibration Product News Noise-th Uncategorized Vibration Virtual Data Room

What you need to know about Room Acoustics

In the Southeast Asia region especially, acoustic properties of residential buildings are often neglected by designers, developers, contractors, and even home buyers. Noises from both internal and external environments affects occupants’ daily lives, causing nuisance which can strongly deteriorate one’s living quality as a long-term effect. In this article, we will investigate building/room acoustics, and the actions that can be undertaken to improve the acoustical environment inside a building.

Room acoustics

In general, the acoustics of rooms can be divided into two groups: low frequency and high frequency. Sound in rooms can be highly affected by the reflective properties of the surfaces in the room. This is because multiple reflections may occur if the room surfaces are highly reflective, which then leads to a reverberant field in addition to the direct field from the source especially at higher frequency range. Therefore, at any point in the room, the overall sound pressure level is influenced by the energy contained in both the direct and reverberant fields (Crocker, 2007).

Sound transmissions in buildings

Sound can be transmitted within a building by transmitting through air in the spaces bounded by walls or roofs/ceilings, known as airborne transmission. Another way would be through structural transmission through the structural assemblies of the building, or impacts.

Airborne sound originates from a source that radiates sound waves into the air, which would then impinge on the building surfaces. A good example of airborne sound will be speech, or music from a television or loudspeaker. On the other hand, impact sound is being generated when an object strikes the surface of a building. The commonly heard impact sounds that we can hear in buildings are footsteps, furniture-dragging sounds, cleaning, and other equipment that is used directly on the floor surfaces. To overcome these noises, good sound isolation should be considered for all the possible paths for sound and the junctions between walls and floors, not just at the direct path through common wall or floor.

Sound insulation – airborne and impact

It is imperative to consider the control of airborne and impact sound transmission through the building elements like walls, ceilings, or floors, as stated above. In this case, sound insulation methods will be crucial. Different methods can be implemented for airborne, impact and flanking sounds (Crocker, 2007).

For airborne sound, insulation can be applied at any building element. This is because when sound hits on a surface, a very small fraction of the incident energy will be radiated from the other side. The sound transmission loss (TL), which is the ratio of the incident sound energy relative to the transmitted sound energy is typically measured. TL can be expressed in decibels (dB), and it is sometimes known as sound reduction index (R) in European and ISO standards. The elements to be used in buildings for sound insulation are measured in accordance with standards, where the commonly seen method would be the two-room method. A test specimen would be mounted between a reverberant source room, and a receiver room such that the only significant path for sound to transmit through is the specimen, and other possible transmission paths would be suppressed. As such, it will be useful to determine the TL of the building elements/materials so that one can estimate the airborne sound insulation performance inside the building space.

As for impact sound which typically radiates from a floor into rooms below or horizontally, insulation can be done via floor coverings or floor slabs. This is because the applications of these items can reduce the impact sound pressure levels that travels into the receiver room. The typical methods of insulation are adding soft floor coverings on concrete slab, increasing the thickness of concrete floors, or implementing floating floors.

Single number ratings

To know the acoustic information of an insulation element, the standard method would be to refer to the single number ratings of that element. These ratings would be assigned to building materials based on their sound transmission spectra by the means of reference curves or weighted summation procedures.

The most used single-number rating for airborne sound insulation is the Sound Transmission Class (STC), which is in accordance with the American Society for Testing and Materials (ASTM) E413. There is another equivalent number called the Weighted Sound Reduction Index (Rw), which is based on the International Organization for Standardization (ISO) standard ISO 717.

The figure above shows an example of STC contour fitted to a concrete slab’s data. The differences between data points below the contour line and the value of contour are called the “deficiencies”. According to ASTM E413, the sum of deficiency should not be greater than 32 dB, and each individual deficiency should not exceed 8 dB (also known as the 8-dB rule). The reference contour for ASTM covers the frequency range from 125 Hz to 4000 Hz. The Rw contour from the ISO 717 has the same shape, except that it covers a broader frequency range of 100 Hz to 3150 Hz. Also, there is no 8-dB rule in ISO 717. Comparing both standards, the numbers from both ratings are usually close. However, the weighted summation method developed in ISO 717 accounts for the higher importance of low frequencies in traffic noise and modern music systems. As such, this method allows corrections/spectrum adaptation terms to be produced that can be used in conjunction with the Rw rating.

As for impact sound insulation, the sound pressure levels are often collected using a standard tapping machine and normalised, which will then be used with a reference curve to calculate its rating, typically the Impact Insulation Class (IIC), or the weighted index Ln,w. In fact, these ratings are commonly used in building codes. Again, the rating curves are identical in each standard, but there are some differences among them still. For instance, the ASTM IIC method does not allow any unfavourable deviation to exceed 8 dB. An increasing IIC rating would indicate that the impact sound insulation improves. Conversely, the Ln,w rating would decrease as the impact sound insulation gets better. We can take the relationship between both ratings as follow (assuming that the 8-dB rule is not invoked):

However, there is debate regarding the usefulness of ISO tapping machine data obtained on different types of floors. Therefore, the latest version of ISO 717-2 proposed the use of C1, a spectrum adaptation term to consider low-frequency noise that is normally generated below a lightweight joist floor.  is the unweighted sum of energy in the one-third octave bands (50 or 100 Hz – 2500 Hz) minus 15 dB. According to the standard, this rating is expected to have a better correlation with the subjective evaluation of noise coming below floors, especially for low frequency ones.

The single rating numbers mentioned above are all useful when it comes to determining the level of acoustic insulation a material can provide. With the explanation above about room acoustics and the insulation measures that can be implemented, it will give a better idea on how one should tackle and handle the room acoustics in a building.

References

Crocker, M. J. (2007). Chapter 103: Room Acoustics. In C. H. Hansen, & M. J. Crocker (Ed.), Handbook of Noise and Vibration Control (pp. 1240-1246). Adelaide, South Australia, Australia: John Wiley & Sons, Inc. doi:ISBN 978-0-471-39599-7

Crocker, M. J. (2007). Chapter 105: Sound Insulation—Airborne and Impact. In A. C. Warnock, & M. J. Crocker (Ed.), Handbook of Noise and Vibration Control (pp. 1257-1266). Ottawa, Ontario, Canada: John Wiley & Sons, Inc. doi:ISBN 978-0-471-39599-7

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Asia Noise News Environment Home

Noise caused by construction works at night in Netizen

A video she had filmed of the construction site shows the drone of the machinery could be heard reverberating along with the backup beeper of a truck at the site. This can go on up to 3 am as reported by the netizen.

Singapore — A member of the public has taken to Facebook after she realized that construction works were being carried out near her apartment even at night, causing a lot of noise in the area. 

She put up a post on the Facebook group “Complaint Singapore” to seek advice from other netizens who might have encountered a similar situation before.

In her post, a member of the public also included a video she had filmed of the construction site. In the video, the drone of the machinery could be heard reverberating along with the backup beeper of a truck at the site.

According to the caption of the post, this was not the first time that such an incident had occurred. The member of the public also mentions that the construction works had gone on until 3 AM on a previous occasion. As such, she asked other netizens for help on who to contact on the issue, since the sounds generated by the construction works can be quite loud and disruptive.

Other netizens shared their views on the matter and offered suggestions in the comments section. 

A few netizens chalked the nighttime construction down to urgency, saying that there might be an emergency that needs fixing quickly and promptly.

Some other netizens thought that carrying out construction work at night, would impede the flow of traffic less since there are fewer commuters during the night.

A few other netizens suggested that the poster bring the issue up to the relevant authorities such as the National Environment Agency (NEA), the Land Transport Authority (LTA), or the Singapore Police Force (SPF).

After contacting NEA, the poster replied that they were helpful in stopping the works at an earlier hour.

According to NEA, construction sites need to observe the noise level and exercise construction noise control with effect from 1 Oct 2007. 

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Asia Noise News Building Accoustics Building Acoustics Environment Home Industrial Noise and Vibration Product News Noise-th Vibration Virtual Data Room

The power of trees can reduce noise.

The way most workers need to complete tasks have significantly changed the way companies use their spaces. Quiet spaces are needed for deep, focused work. Technology enabled meeting rooms and collaboration spaces are used for productive meetings. Ideally, an office is designed in such a way that it enables team members to do their best work.

Unfortunately, it can be difficult to make sure a design includes all these aspects. As a result, designers and architects still often have to leave space for cubicles and open office spaces, a big contributing factor to general noise levels.

Did you know? Planting trees in your home or office not only helps to cool the internal temperature, increase the oxygen in the air give a feeling of freshness, and help relax only. But plants can also HELP ABSORB NOISE!

One creative way to both combat office noise and bring biophilic elements to a design is to incorporate plants and greenery into a space. Studies have shown that both plants and living green walls are an effective way to absorb sound and noise pollution.

Beyond their sound absorbing qualities, plants and biophilic elements can help to improve a worker’s overall well-being. Access to natural elements like greenery, natural light, and organic textures have been found to both improve employee productivity and reduce absenteeism. Plants have been found to be a mood booster and a stress reliever for team members, which can in turn, help to improve an employer’s bottom line.

Do Plants Help to Absorb Sound?

There is quite a bit of research on the subject, but the short answer is yes. The flexible and porous nature of indoor house plants acts as natural sound reducers. There are three ways that house plants can reduce the sound in your home or office: deflection, absorption, and refraction.

Most people do not understand the sound absorption benefits of houseplants. However, they really do help with absorption sound.

How Plants Reduce Indoor Noise Levels?

As mentioned above, plants reduce noise levels through three different methods: deflection, absorption, and refraction.

  • Deflection – Sound waves tend to bounce around off hard surfaces. That is where all that added noise comes from. Walls are rigid and will amplify sound, while plants are flexible and help to deaden the sound by breaking up the sound waves into other forms of energy.
  • Absorption – Plants are great at absorbing sound because of the leaves, branches, and wood. Wood is a great sound absorber. Have you ever walked through a forest and been amazed at the silence? That is because the trees are absorption all the ambient noise.
  • Refraction – Refraction is taking away the echoes of the sound bouncing off the hard surfaces. Plants will help to refract this noise and eliminate the echoes which are responsible for much of the added noise in your home or office.

The indoor plants that work best at absorbing sound such as:

  • Ferns: have a lot of surface space to help reduce sound. Their wide leaves spread out and cover quite a bit of area.
  • Baby’s Tears: Baby’s Tears are a dense plant that looks almost like moss. The plant has a way of draping itself over the pot and makes a great sound reducer when elevated off the ground.
  • The Peace Lily: The Peace Lily can absorb some of the sounds with their leaves and do a great job of bouncing the sound to the other plants and is a great sound absorbing plant you can put in your home. Their true noise absorbing properties are in their thick, broad leaves.
  • The Rubber Plant: The beauty of this plant is just how big it can get. Rubber plants cover a large surface area which only serves to enhance their sound absorbing properties.
  • Fiddle Leaf Fig: The fiddle leaf fig is another plant with broad, thick leaves. They can grow tall, and the cupped shape to the leaves make for an effective sound absorber.

Reference :

พลังจากต้นไม้ ลดมลพิษทางเสียง

https://bettersoundproofing.com/best-sound-absorbing-indoor-plants/

The Top Sound Absorbing Plants For The Workplace

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Asia Noise News

Singapore to Ban Older Motorcycles

As motor vehicle emissions regulations tighten around the world, it should come as no surprise that Singapore is set to restrict motorcycles registered before July 1, 2003, and effectively ban them after June 30, 2028. The island city-state is under 800 km2 in area, yet is home to 5.7 million residents (denser than Hong Kong), and is known for its strict laws, cleanliness, and low crime rate.

The restrictions were introduced in 2018, and Singapore’s National Environment Agency (NEA) released new information and guidelines on the emissions regulations and standards in April of this year. The laws come into effect on April 26, 2023, after which time, qualifying motorcycles must meet tighter emissions standards of “4.5% Carbon Monoxide (CO) by Volume; and 7,800 ppm Hydrocarbons (HC) (for 2-stroke engine) or 2,000 ppm HC (for 4-stroke engine)”, as per the NEA documentation. After June 30, 2028, these motorcycles will either be banned, or the owner can apply to be given a temporary permit with usage stipulations, until such time as they are eligible for Classic Vehicle status, which in Singapore is 35 years or older.

The NEA estimates that most of the eligible motorcycles will be able to pass the required emissions standards with proper, regular maintenance. Owners can have their vehicles tested at an approved inspection station to ensure they pass the standards.

The new laws will apply equally to locally owned, as well as foreign motorcycles entering Singapore. Foreign motorcycles must also meet local noise regulations, and must not emit any smoke or visible vapor. Enforcement is planned via random emissions testing blitzes at land entry checkpoints.

For owners of older motorcycles, the NEA is offering an early de-registration incentive of up to $3,500, to encourage owners to get these bikes off the road. According to the NEA, almost 60% of the 27,000 eligible motorcycles have so far been de-registered via this program.

Sources: motopinas.com, http://nea.gov.sg

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Noise and Vibration Product News

ListenEAR noise dosimeter, noise dosemeter OSHA, ISO9612

Listen Ear Personal Noise Dose Meter Noise & Vibration Registration Instruments and Software, ISO9612, OSHA

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•Fast & Slow Time Weighting

•A, C, & Z Frequency Weightings

•Equivalent Continuous Noise Dose (LEQ)

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•Current Dose Projected Dose at 8hrs Temperature & Humidity Readings Complies with IEC61672-1, IEC61252 Visual 2 Tier Alarm Setting Optional External Microphone •AntiKnock, Movement and Orientation Monitoring

•Ability to Pre-Program with Ear Defender SNR Values

ON-SCREEN VIEWS  CURRENT PLUS MIN & MAX SOUNDLEVEL

READ MORE….