Fashion Simple Clip-on Wireless Bluetooth Headset

Product information:
Bluetooth version: V5.2
Battery capacity: 400mA
Transmission Distance: 10 meters
Product impedance: 4000
Sensitivity (microphone):-38dbv/pa
Charging time: about 1 hour (it is better to charge for the first time than 1 hour)
Overcharge Protection: 0.1 * 250mA = 25mA
Undervoltage protection: Vin = 4.4V
Operating temperature/storage temperature:-20°C to 70°C