Choetech MEMS Mic V5.3 Mini Bean TWS Earphone (Black)

Bluetooth Version 5.3 
Frequency range 20Hz～20KHz
Headphone battery capacity 30mAh
Charging compartment battery capacity 300mAh
Transmission distance 10M
Call duration 2 hours (80% volume)
Play time 4 hours (80% volume)
Standby time: about 30 hours
Headphone charging time: about 1.5 hours
Charging time in the charging compartment is about 2 hours
Speaker Φ8mm @32ohm
Impedance 32Ω±15%
Charging compartment battery capacity 300mAh/ 3.7V / 1.11Wh
(Input) Charging compartment 5V-0.5A
(Output) Charging compartment 5V- 0.3A