Technologies used: BT 5, SBC, AAC, ACT Active Noice CanellingBluetooth version: Bluetooth 5 (BT 5)Built-in microphones: ECM with ambient noise reduction systemMicrophone sensitivity: -42dB 3dBMicrophone frequency range: 100Hz - 10kHzCharging time: 2 hoursWorking time: 40 hoursHeadphone battery type: Li-polymer (500mAh)Charging connector: USB-C (Fast charge connector)