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 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 BluetoothA(R) connection is searchable using your input device. Featuring: Bluetooth Version 5.0 Realistic natural hear-through 85dbB sound compression USBC rechargeable battery Cable included Specifications: Noise Reduction Rating (NRR): 29dB Intuitive volume controls Realistic, natural hear-through functions with analog circuitry 9mm Dynamic range speaker 2x Omni-direction in-ear microphones Device actively listens and automatically stops amplification when loud impulse sounds like firearms discharges exceed 85dB Run-time of 50 working hours USBC Rechargable with a charging time of 2 hours Unit Battery Type: 200mAh Lithium Battery Flexible, moldable earhook In-Ear profile allows for full clearance of firearm stock Inside The Box: 1x Earphone Unit Convenient Carrying Case 3 Pairs of Foam Eartips (Small, Medium, Large) USB-C Charging Cable Cable Adjuster User Manual