TRACKR Electronic earmuffs give you a compact design for comfort and size for all your environments where you need to hear and protect your hearing at the same time. Clear, smooth sound enhancement lets you hear what you want while protecting your hearing from damaging loud sounds. Features two directional microphones; full dynamic range, high-fidelity speakers for clear balanced sound; low noise/frequency tuned for natural sound clarity; single volume control; sound dampening composite housing; sound activated compression - 0.02 second reaction time; audio input jack; recessed volume control knobs;comfortable headband with metal wire frame and external battery door. Includes two AAA batteries.