Howard Leight by Honeywell Impact Pro Sound Amplification Electronic Shooting Earmuff, Black & Grey (R-01902) Built-in directional microphones amplify range commands and other ambient sounds to a safe 82 dB, providing more natural listening and enhanced communication Actively listens and automatically shuts off amplification when ambient sound reaches 82 dB; passively blocks out noise at 30 dB Rubberized pressure points prevent gunstock scratching; padded adjustable headband provides a secure and comfortable fit Includes 3.5 mm connection cord for MP3 players and scanners; includes 2 AAA batteries; automatic shut-off feature after 4 hours increases battery life; approx. 350 hours battery life; Works well and long with Polaroid AAA Batteries Noise Reduction Rating: 30