When the electronic earplug protection is worn correctly, it provides passive protection of 29 dB. When switched on, Bluetooth® and the listening circuit are both turned on, and the device employs built-in directional microphones that amplify ambient sounds to a safe 85dB. This allows the ear to hear important commands on the range and crucial environment sounds when hunting for additional protection. It also actively listens and automatically stops amplification when loud impulse sounds like firearms discharges exceed 85 dB. The Bluetooth® connection is searchable using your input device. Bluetooth Version 5.0. Realistic, natural hear-through functions with analog circuitry. 9mm Dynamic range speaker. 2x Omni-direction in-ear microphones. The device actively listens and automatically stops amplification when loud impulse sounds like firearms discharges exceed 85dB. Run-time of 50 working hours. USBC Rechargeable with a charging time of 2 hours. Unit Battery Type: 200mAh Lithium Battery Flexible, moldable ear hook. In-Ear profile allows for full clearance of firearm stock. 3 Pairs of Foam Eartips (Small, Medium, Large).