Headphone Type:-In-Ear HD Sound:-Yes Bluetooth Version:-V5.1 Driver Size:-13mm x 2 Drivers Bluetooth Profiles:-HSP, HFP, A2DP, AVRCP Frequency:-20Hz-20KHz Voice Assistant:-Yes Charging Voltage:-5VDC Earphone battery capacity:-3.7V, 40mAh x 2 buds Talk time/music time:-3 Hours per bud Charging Time:-2 Hours Standby Time:-100 Hours Bluetooth Range:-10M