When the electronic ear plug protection is worn properly, it provides passive protection of 29dB. When switched on, BluetoothA(R) and listening circuit are both turned on, and the device mploys 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. Features: Noise Reduction Rating (NRR): 29dB Individual and simultaneous BluetoothA(R) VER 5.0 Individual BluetoothA(R) button with volume control and separate hear-through volume control Realistic, natural hear-through functions with digital circuitry 9mm Dynamic range speaker 2x Omni-direction in-ear microphones Device actively listens and automatically compresses amplification when loud impulse sounds like firearms discharges exceed 85dB Run-time of 10 working hours USBC Rechargable with a charging time of 2 hours Unit Battery Type: 200mAh Lithium Battery Flexible, moldable earhook 3 different ear tips for ideal ear canal fit