The Tactical Sport Hearing Protector electronic earmuff uses proprietary integrated circuit technology for a refined audio reproduction. It gives users fast shutoff and recovery time while helping protect hearing from harmful impulse noises such as gunfire. Sound amplification allows the user to hear low-level sounds including range commands and conversation. NRR 20 dB ASIC chip technology for a refined audio reproduction Audio jack for external components such as cell phones MP3 players and dog trackers External battery compartment for convenient access Powered by 2 AAA batteries 500 hours of battery life includes auto shutoff feature Designed for all-day comfort Ergonomically designed contoured ear cups Interchangeable black and orange ear cup covers