Electronic Shooting Earmuffs Detachable microphone Removable microphone, 2 sides microphone port convenient for right and left use Professional noise reduction technology,suppresses harmful noise above 90 dB. Effectively protect your hearing Fully adapted helmet rail With Fast Helmet Rail Adapter, can mount directly to the helmet, fits for all 19-21mm rail. Update new version rail adapter can be rotated 360 degresss will be easy to adjust possition of comta headset Flexibly adjust the angle, adjustable lengthHelmet wearing Widely use Suitable for many occasions, such as shooting,hunting,chainsaw,machining or in a noisy environment. Used with helmet, if you want wear independently from a helmet, you would have to buy a head band Wearing Method Helmet wearing Function electronic sound pickup & noise reduction Material Sound insulation cotton,ABS(shock proof fiber additive type) Effect of soundproof Effective 27 decibel of sound insulation Decibel filter NRR: 2b SNR:27db (Suitable for noise level:>=90 decibel)