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; super deluxe padded headband features telescopic height adjustment for a secure and comfortable fit; 3.5mm connection cord for MP3 players and scanners; includes 2 AAA batteries; automatic shut-off feature engages after 4 hours to help save battery life; approx. 350 hours battery life; Designed for handgun and pistol shooters looking for high NRR; perfect for indoor ranges, covered ranges or other extremely loud shooting environments