The Razor Electronic Slim Shooter Folding Muff features two omni-directional microphones with full dynamic range HD speakers for clear balanced sound. The sleek muffs also have an audio input jack, recessed volume control knobs, sound dampening composite housing, and AAA (2) batteries included.Specifications and Features: Two Omni Directional Microphones Full Dynamic Range HD Speakers for clear balanced sound Low Noise / Frequency tuned for natural sound clarity Independent Volume Controls Sound dampening composite housing Sound Activated Compression 0.02 second reaction time Audio Input Jack Recessed Volume Control Knobs Comfortable headband w/metal wire frame External Battery Door Operates on 2 'AAA' batteries - Included