Razor Slim Hearing Protection and Sound Amplification Electronic Muff in Flat Dark Earth Razor series muffs feature 2-Omni directional microphones, full dynamic range HD speakers for clear balanced sound output, independent volume controls, audio input jack and a sound dampening composite housing with ultra-low profile rubberized cups and comfortable headband. Low noise frequency tuned for natural sound clarity. Sound activated compression provides 0.02, 2nd reaction time. Operates on 2 AA batteries. Ultra low profile ear cups 2-hi gain omni directional microphones Noise reduction rating 23 2-omni directional microphones Full dynamic range HD speakers for clear balanced sound Low noise/frequency tuned for natural sound clarity Independent volume control Sound dampening composite housing Sound activated compression 0.02, 2nd reaction time Audio input jack Recessed volume control knobs Comfort headband with metal wire frame Operates on 2 AAA batteries - included