Brand: Faster Model No: S5 Bluetooth Version: Bluetooth V5.3 ANC Frequency Range: 20-600Hz Battery Specification: 3.7V/500mAh Working Frequency: 2.402GHZ -2.480GHZ Charging Time: about 2.5h Working Time (Only Bluetooth): about 50 h Working Time (Only ANC): about 60h Working Time (bluetooth+ANC): about 40h Noise reduction value: -20 ± 3db Charging Voltage: 5V/1A Warranty: 1 Year