SPECIFICATIONS: 
*Bluetooth version: V5.0

*Effective distance: <10m Impedance: 16 15%

*Frequency Range: 20~20KHZ 

*Charging Box Battery Capacity: 320mAh 

*Earphone charging time: 35mins 

*Charging Box charging time: 

1 hours (usb charging) or 

1.5 hours (wireless charging)

*Using time: about 3 hours 

*Stand by time: about 80 hours