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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.

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Solutions 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.

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

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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.

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The professional team provides 24 * 7 after-sales service for you, which can help you solve any problems

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Factory workshop workers helmet picture appreciation
Ear Plug Decibel (dB) Curve and High Fidelity Sound
Ear Plug Decibel (dB) Curve and High Fidelity Sound

The most common type is a foam ,ear plug,. ,The differences, in sound quality ,between, different brands of foam ,ear plugs, are very meaningful. The same is true for reusable earplugs and custom-made earplugs. How good the sound quality of an ,ear plug, is can be estimated by looking at the ,ear plug,…

Understanding Coaxial Cables - The Complete Guide
Understanding Coaxial Cables - The Complete Guide

RG58 and RG174 cables are used in cell phone signal boosters for vehicles. ,The difference between, the two is the better ,low,-loss quality of the RG58 with cable length up to 20 feet compared to the RG174’s 6 feet. For large vehicles, such as RVs or boats, the RG174 is …

Guide to Selecting the Right Ear Muff -- Occupational ...
Guide to Selecting the Right Ear Muff -- Occupational ...

1/6/2015, · Wearing hearing protection can mean ,the difference between, enjoying the sounds of ... high and constant select either a muff or ,plug, protector to reduce the ... mainly of ,low,-,frequency, ...

Woofers Tweeters and Crossovers - High mid and low ...
Woofers Tweeters and Crossovers - High mid and low ...

That’s where woofers and tweeters come in. A woofer is a speaker designed for ,low,-,frequency, sounds and a tweeter is a speaker designed for high-,frequency, sounds. Woofers. At a glance, the main ,difference between, woofers and tweeters is that the woofers are a lot larger than the tweeters. A good woofer might be 12 inches in diameter or more.

What is the most efficient ear plugs for blocking out the ...
What is the most efficient ear plugs for blocking out the ...

I heard someone say that bacteria multiply as the heat builds behind the ,plug,. Are the bacteria good-or bad? Noise cancelling headphones operating by a battery like the Bose type do not cancel knocking or talking sounds. Only hissy types like air ...

High Pass Vs Low Pass Filter - What's the difference? - 3D ...
High Pass Vs Low Pass Filter - What's the difference? - 3D ...

19/1/2020, · EQing needs a critical ,ear,, and knowing what pass filters do and how they work is vital for improving skills. Understand the Names. You are sure to come across the other names for these filters as well, i.e., High Cut and ,Low, Cut. A High Cut Filter is a term used to describe ,a Low, Pass Filter, and ,Low, Cut is for a High Pass Filter.

What is considered low or high frequency? - Electrical ...
What is considered low or high frequency? - Electrical ...

It could be either, depending on context, really. 4100 Hz might be high ,frequency, for the bandwidth of a programmable power supply, but ,low frequency, to a broadband amplifier. In the particular case you mention, it is relative to the clock used to time the period ,between, edges of the incoming waveform.

what's the difference between XLR and 1/4
what's the difference between XLR and 1/4" cable? Balanced ...

26/6/2006, · Probably what is happening in your case is the microphone is a Lo-Z (,low, impedance) microphone and it HAS to ,plug, into the XLR. The reason being is microphones put off a very ,low, voltage signal that has to be amplified. And in a mixer, after the XLR points, is a preamplifier that amplifies this ,low, level signal up to line level.

Fitting Tips: How Do Vents Affect Hearing Aid Performance ...
Fitting Tips: How Do Vents Affect Hearing Aid Performance ...

The OE is measured as ,the difference between, the real-,ear, occluded response (REORv) and the real-,ear, unaided response (REURv) during vocalization of /i/. For both styles of hearing aids, the average OE has a peak ,frequency, around 300-400 Hz with a peak amplitude of about 20 dB.

Moulton Laboratories :: The Microphone vs. the Ear
Moulton Laboratories :: The Microphone vs. the Ear

More ,Ear, Tricks So far, we've seen that the human ,ear, can figure out where a sound is coming from, that it has a built-in automatic level control with multiple time constants, and that at the basilar membrane it converts the sound wave into 30,000 or so neural signals, each representing a single ,frequency, (this is roughly akin to doing a so-called Fourier Transform, a rather daunting ...