DESCRIPTIONImpact Sport Bluetooth Earmuffs provide passive protection of 21 dB. When Bluetooth and listening, circuits are engaged, the device employs built in direction microphones that amplify ambient sounds to a safe 85 dB. This allows the ear to hear important commands on the range and crucial environment sounds when hunting. It also actively listens and employs faster Sound-Activated Compression at 0.5 millisecond reaction time stopping amplification when loud impulse sounds like firearms discharges exceed safe 85 dB level.The Bluetooth function keeps you always connected using your phone or other input devices. Impact Sport's sleek, extremely low-profile design with carefully engineered cutouts facilitate the shouldering of a rifle or shot gun while maintaining clearance from firearm stock.