The Razor Slim electronic ear muff features an ultra-low profile compact designWith its ultra-compact design, the Razor Slim electronic muffs offer superior hearing protection in a low-profile design. Two hi-gain omnidirectional microphones pick up outside noise and broadcast it through full dynamic range HD speakers for an ultra-clear, balanced sound. Sound activated compression has a blazing fast 0.002 second reaction time to ensure your hearing is always protected. The Razor Slim electronic ear muffs are priced right and packed full of innovation.2 HI-GAIN OMNI DIRECTIONAL MICROPHONESFULL DYNAMIC RANGE HD SPEAKERS FOR CLEAR BALANCED SOUNDLOW NOISE / FREQUENCY TUNED FOR NATURAL SOUND CLARITYINDEPENDENT VOLUME CONTROLSSOUND DAMPENING COMPOSITE HOUSINGSOUND ACTIVATED COMPRESSION 0.02 SECOND REACTION TIMEAUDIO INPUT JACKRECESSED VOLUME CONTROL KNOBSCOMFORTABLE HEADBAND W/METAL WIRE FRAMEEXTERNAL BATTERY DOOROPERATES ON 2 AAA BATTERIES INCLUDEDNoise reduction rating 23 (when used as directed)