Compact, lightweight electronic muffs let you hear conversation and range commands, while blocking out dangerous noises like gunfire to protect your hearing. Ultra-fast response electronics amplify ambient sounds to a safe 82 decibels (dB), yet shut down when sounds above 82 dB are detected to let the muff's passive hearing protection take over. In amplification mode, directionally placed stereo microphones even help you hear where the sound is coming from. Built-in AUX input accepts 1/8" (3mm) stereo plug (patch cable included) to connect an MP3 player, radio, or other audio device. Electronics automatically shut-off after 4 hours to preserve battery life. Bottom half of the low-profile ear Mfg: Howard Leight SPECS: Molded polymer, O.D. Green. NRR 22 dB. Weighs 10.4 oz. (295g). Uses two AAA batteries, included; 350 hours continuous operation.