TEKTRUM ACTIVE VOLUME NOISE-BLOCKING ELECTRONIC EARMUFF HEARING PROTECTOR FOR SPORTS SHOOTING HUNTING - BLACK Active volume hearing protector; Automatically blocks noise above 85dB, noise reduction rating of 28dB Reduces hazardous impulse noises from firearms to harmless levels within milliseconds; Localizes weak sounds and attenuates impulse sounds Equipped with Stereo microphones to enhance sound localization; Amplifies conversation and commands with one single volume control knob Magnifies distortion-free low-level sounds up to 19dB; External audio input connects to MP3 players for listening music Powered by 2x AAA batteries and provides up to 200 hours of use; Lightweight and portable