Product Feature: Bluetooth version:V5.0Frequency range:2.4GHz-2.48GHzTransmitted power:Class 2Working Range:Around 10m (open space Max.20m)Charging Voltage:5V 0.5AOperating voltage:3.7VStandby current:<0.02mA Music time: ≥10HTalk Time:≥10HStandby Time:>150HCharging time:<2HMIC:40dB±2dBSpeaker:Φ40mm/32ΩOutput power:>10mWOutput Frequeney:20Hz-20KHzBatter: Built-in lithium 350mAWorking Temperatuer:-10~+55℃Packing list:earphone * 1 ;Audio cable * 1;USB cable * 1;manual * 1;