● BT Specification:  Bluetooth V5.3
● BT Chipset: AC7003F4                                                                               
● BT Profiles Supported:  A2DP, AVRCP, HFP, HSP.
● Operating Distance:  10 meters
● Speaker diameter: 40mm
● Impedance:  32Ohm
● Sensitivity:  85dB at 1KHz
● Frequency Range:  20Hz – 20KHz
● Rechargeable Battery: 170mAh Li-on Battery
● Working Voltage:  3.7V
● Standby Current:  ＜8uA
● Max working electric current: 7mA
● Socket:  Micro USB (B type)
● Talk time:  24 hours
● Music time: 24 hours at 80% volume
● Standby Time (un-paired):  90 days or more
● Charging Time:  2 hours