Walker's Razor Slim Profile Electronic Earmuffs - The Razor Slim Profile Electronic Muff provides hearing protection from loud noises and environments such as construction equipment or industrial job sites. When powered on, the Razor Slim Muff detects any sound over 80dB and triggers the compression circuit to deaden all incoming sound. Full Range Sound With Enhanced Quality Two Omni Directional Microphones Full Dynamic Range HD Speakers Independent Volume Control Sound Dampening Composite Housing Sound Activated Compression 0.02 Second Reaction Time 3.5mm Audio Input Jack For Secondary Audio Input Recessed Volume Control Knobs Comfort Headband with metal wire frame Operates On 2 ‘AAA’ Batteries 80 Hours Battery Life