Features: 22dB Noise Reduction Rating (NRR) Automatically shuts off noise over 82dB Up to 4X amplification Sleek, extremely low-profile earcup design with cutout allows for clearance of firearm stock Adjustable fit Convenient folding design for easy storage Premium padded headband Recessed stereo microphones Single control knob for on/off and volume adjustment Efficient power consumption and automatic 4-hour shutoff deliver 350 hours of battery life AUX jack connects to MP3 players and scanners (3.5mm audio connection cord included) Powered by two included AAA batteries Replacement ear cushions available