Bluetooth version：5.3
 Support protocol：A2DP/HFP/SPP/HID/PBAP
 Bluetooth range：10-15m
 Battery capacity：50mA
 Charging box battery capacity：400mAh
 Charging time：About 1 h
 Call&playing time：About 5 h
 Speaker size：10mm
 MIC Sensitivity: -42dB±3dB
 Frequency response：40Hz-20KHz
 Impedance：32Ω
 Sensitivity：106±3dB
 Charging specification：5V/1A
 Operating voltage：3.7V-4.2V
 Packaging what's in the box: 
 2 * Wireless Bluetooth Earphone
 1 * Charging box
 1 * type-c charging cable
 1 * User manual                                    

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