Howard Leight by Honeywell Impact Sport Sound Amplification Electronic Shooting Earmuff with Hard Case (R-02601) 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; Noise Reduction Rating (NRR): 22 Features low profile earcups for firearm stock clearance; adjustable headband for secure fit; compact folding design for convenient storage; tactical black color Includes AUX input and 3.5 mm connection cord for MP3 players and scanners; Includes 2 AAA batteries; auto shut-off after 4 hours increases battery life; approx. 350 hours battery life Comes with hard carrying case that includes 2 additional ear cushions, cloth bag, and storage slots for earmuff, auxiliary cable and batteries