BT Specifhcation : Bluetooth V5.0  BT Chipset : JL   BT profiles Spported ; A2DP.AVRCP,HFP.HSP  Opertaing Distance : 1 0eters  Speaker diameter :7mm  Impedance : 32Ohm  Sensitivity: 102dB at 1khz  Frequency range : 20Hz-20Khz  Rechargeable Battery :30mAH in each earbuds  Rechargeable battery : 300mAH in charging case  Working voltage :3.7 V  Standby Current: 8uA  Max working electric current : 13mA  Socket : Micro USB ( B type)  Talking time : 4.5 Hours  Music time : 3.5 hours  Standbty time (un- paried ): 90days or more  Charing time : 2 hours  Operating range : about 10 meter