OPSMEN Tactical Earmor M32H Electronic Headphones for FAST Helmets (Black) Noise reduction rating + NRR22 Provided with electronic restoration of surrounding sound. Electronic volume,on/off switch reminder tone Suppresses gunshot noise above 82 dBA and amplifies low-level sounds. Power by 2x AAA batteries, New alkaline batteries provide approx. 350 hours' operation. Pronunciation ergonomic design more fitting ear Built-in NATO Military Standard 7.0 Plug for PTT Detachable microphone for both left or right handed assembly An anti-sweat, comfortable ear cup for continued wearing. Foldable ear cup design. Waterproof in accordance with IPX-5 Tested and approved in accordance with CE / RoSH / ANSI S3.19-1974 Standards. Items included: 1x Earmor Tactical Hearing Protection Ear-Muff with helmet rail adaptors Fit Earmor or Military Type PTT ONLY Helmet and PTT are NOT included