product details:
Bluetooth version: 5.0
Protocol: A2DP/AVRCP/HFP/HSP/SPP
* Battery capacity: 110mAh, base battery: 300mAh
*Call listening to songs: 6-8 hours or so
* Standby time: about 100 hours
*Box battery capacity: 300mAh (charge 2 times)
* Effective distance: 10 meters (TWS-True Wireless)
* Charging time: 1 hour or so
Ipx4 waterproof, support master-slave switch 
