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what is history

Shanghai Sunland Industrial Co., Ltd is the top manufacturer of Personal Protect Equipment in China, with 20 years’experience. We are the Chinese government appointed manufacturer for government power,personal protection equipment , medical instruments,construction industry, etc. All the products get the CE, ANSI and related Industry Certificates. All our safety helmets use the top-quality raw material without any recycling material.

Reasons for choosing us
HARD HAT SAFETY HELMET
01Solutions to meet different needs

We provide exclusive customization of the products logo, using advanced printing technology and technology, not suitable for fading, solid and firm, scratch-proof and anti-smashing, and suitable for various scenes such as construction, mining, warehouse, inspection, etc. Our goal is to satisfy your needs. Demand, do your best.

02Highly specialized team and products

Professional team work and production line which can make nice quality in short time.

03We trade with an open mind

We abide by the privacy policy and human rights, follow the business order, do our utmost to provide you with a fair and secure trading environment, and look forward to your customers coming to cooperate with us, openly mind and trade with customers, promote common development, and work together for a win-win situation.

CONTACT USCustomer satisfaction is our first goal!
Email us

Consultation hotline:0086-15900663312

Address:No. 3888, Hutai Road, Baoshan District, Shanghai, China

what is history
Active noise control - Wikipedia
Active noise control - Wikipedia

Active, vs. passive ,noise, control. ,Noise, control is an ,active, or passive ,means, of reducing sound emissions, often for personal comfort, environmental considerations or legal compliance.,Active noise, control is sound ,reduction, using a power source.Passive ,noise, control is sound ,reduction, by ,noise,-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather than a power source.

Passive vs Active Noise Cancelling Headphones 2020
Passive vs Active Noise Cancelling Headphones 2020

Passive ambient ,noise reduction means, insulating the ears from the external ,noise,. The feature works for higher and middle range frequencies. Passive ,noise, cancellation headphones provide a great experience when the ear cups completely snuggle the ears without leaving a gap.

Shooting Ear Protection: Electronic vs Passive | GruntX ...
Shooting Ear Protection: Electronic vs Passive | GruntX ...

Thanks to their thick padding and materials, passive ,earmuffs, have high NRR scores. ,What does, NRR ,mean,? Well, it stands for ,Noise Reduction, Rating. As the name sounds, it’s a score for measuring how much a product will reduce sound levels. Here’s how it works, the higher the NRR rating, the greater the hearing protection.

Ear muffs | Worker Health and Safety | 3M Canada
Ear muffs | Worker Health and Safety | 3M Canada

The following methods can be used to select the most appropriate HPD: ,Noise Reduction, Rating (NRR), CSA Class, Octave Band or Fit Testing. ,Noise Reduction, Rating The NRR is a single number method that describes the overall sound level ,reduction, across frequencies (attenuation) of a HPD in decibels (dB) based on a laboratory test.

Head Protection | MSA Safety | Singapore
Head Protection | MSA Safety | Singapore

Balanced and lightweight electrician's ,safety helmet,, non-vented, with 6-point Fas-Trac® III ratchet suspension, GS-ET-29 class 1 (4kA) face shield certified for protection against arc flash. For use where top ,impact, hazards to the head, chemical splash, Ultra-Violet radiation, molten metal splash or electric arc to the face exist.

My Top 6 Noise Blocking Earmuffs Review - RememberEverything
My Top 6 Noise Blocking Earmuffs Review - RememberEverything

The attenuation of ,earmuffs, varies greatly with the ,noise, frequency, so the ,noise reduction, rating doesn’t tell the whole story Because the NRR (and the SNR) are weighted averages of tested attenuation levels at various frequencies, two ,earmuffs, with exactly …

Electronic Hearing Protectors - Noise Help
Electronic Hearing Protectors - Noise Help

For information on ,active noise reduction, hearing protectors, click here. Electronic ,ear muffs, use batteries, and are a bit bulkier and heavier than passive muffs. And, naturally, they are significantly more expensive — in the range of $100 to $300 (US dollars), compared with $10 to $50 for passive ,ear muffs,.

Top 5 Noise Cancelling Ear Muffs For Studying And Reading ...
Top 5 Noise Cancelling Ear Muffs For Studying And Reading ...

14/7/2020, · ,Earmuffs Noise reduction, rating (NRR) should be high enough to block the ,noise,. ,Earmuffs, should be comfortable enough to cover the ear properly and there should be no space left to pass air through. NRR stands for the ,noise reduction, rating which gives an idea of the ability of the material to reduce or block the ,noise, for best hearing protection.

Ear Defenders: A buyer’s guide to hearing protection
Ear Defenders: A buyer’s guide to hearing protection

Lower exposure action values (daily or weekly average ,noise, exposure level at which the employer has to provide information and training and make hearing protection available.): Upper exposure action values (daily or weekly average ,noise, exposure above which the employer is required to take reasonably practicable measures to reduce ,noise, exposure, such as engineering controls or other ...

Shooting Ear Protection: Electronic vs Passive | GruntX ...
Shooting Ear Protection: Electronic vs Passive | GruntX ...

Thanks to their thick padding and materials, passive ,earmuffs, have high NRR scores. ,What does, NRR ,mean,? Well, it stands for ,Noise Reduction, Rating. As the name sounds, it’s a score for measuring how much a product will reduce sound levels. Here’s how it works, the higher the NRR rating, the greater the hearing protection.

7 Best Noise Cancelling Headphones for Autism (2020)
7 Best Noise Cancelling Headphones for Autism (2020)

Noise Reduction, Rating: These ,earmuffs, have a ,noise reduction, rating of 22db. This ,means, that they reduce external noises by 22 decibels to dull outside sounds. Over-Ear Cup: As a basic standard, you’ll need cups that go right over the ears to create a full seal from the outside. The ZOHANs do just that.

Active Noise Reduction (ANR) in Hearing Protection: E. H ...
Active Noise Reduction (ANR) in Hearing Protection: E. H ...

protection devices (HPDs) especially for ,earmuffs,, if not also earplugs. ,Noise,-cancellation devices, commonly referred to as ,active noise reduction, (ANR) HPDs, have been the subject of much research and many claims. As ANR developments have continued, not only are analog devices being produced, but digital systems as well.

AirPods Pro Active Noise Cancellation and Transparency ...
AirPods Pro Active Noise Cancellation and Transparency ...

9/5/2020, · With ,Active Noise, Cancellation, an outward-facing microphone detects external sounds, which your AirPods Pro then counter with anti-,noise,, canceling the external sounds before you hear them. An inward-facing microphone listens inside your ear for unwanted internal sounds, which your AirPods Pro also counter with anti-,noise,.

Safety Helmet | Safety Helmet Supplier - Mahalaxi Traders
Safety Helmet | Safety Helmet Supplier - Mahalaxi Traders

Mahalaxmi Traders is a leading supplier of Safety Helmets; we are renowned for supplying best quality Construction Safety Helmets at best price for our customers. With a supply capacity of 50,000 Safety helmets per month, we maintain proper stocks and fulfill the needs of our clients.

ISO/DIS 4869-6(en) Acoustics ? Hearing protectors ? Part ...
ISO/DIS 4869-6(en) Acoustics ? Hearing protectors ? Part ...

Active noise reduction earmuffs, are designed to provide additional attenuation of external sounds by ,means, of a ,noise, cancellation circuit. This additional attenuation is usually provided at low frequencies. Such ,earmuffs, may be selected for use in low-frequency dominated high ,noise, environments.

AirPods Pro Active Noise Cancellation and Transparency ...
AirPods Pro Active Noise Cancellation and Transparency ...

9/5/2020, · With ,Active Noise, Cancellation, an outward-facing microphone detects external sounds, which your AirPods Pro then counter with anti-,noise,, canceling the external sounds before you hear them. An inward-facing microphone listens inside your ear for unwanted internal sounds, which your AirPods Pro also counter with anti-,noise,.

What’s the Difference Between Passive and Active Noise ...
What’s the Difference Between Passive and Active Noise ...

Active Noise, Cancellation. ,Active noise, cancellation (ANC) is the process of using a microphone to monitor environmental ,noise, and creating anti-,noise, that’s then mixed in with audio playback to ...