The Walker'sA(R) Razor Slim Electronic Muff features advanced sound-activated compression technology, effectively reducing harmful noises like gunshots and loud machinery to safe levels, while still allowing you to hear important ambient sounds. 2 Hi-Gain omni-directional microphones Full dynamic range HD speakers for clear and balanced sound Low-noise/frequency tuned for natural sound clarity Independent volume controls Sound-dampening composite housing Sound Activated Compression with 0.02-second reaction time Noise Reduction Rating (NRR) of 23dB Audio input jack Recessed volume control knobs Comfortable headband with sturdy metal wire frame External battery door Runs on 2 AAA batteries (included) Order today!