Product Parameters:Bluetooth version:V5.0Frequency range:2.4GHz-2.48GHzWorking Range:Around 10m (open space Max.20m)Charging Voltage:5V 1AOperating voltage:3.7VStandby current:<0.02mA Music time: ≥7HTalk Time:≥7HStandby Time:>148HCharging time:<2.5HMIC:40dB±2dBSpeaker:Φ40mm/32ΩOutput power:>10mWOutput Frequeney:20Hz-20KHzBatter: Built-in lithium 400mAWorking Temperatuer:-10~+55℃Packing list:earphone * 1Audio cable * 1USB cable * 1manual * 1