Model: U8I-B
Bluetooth Normal: V5.0
Radio Profile: A2DP, HFP, HSP, AVRCP, SPP
Operating Area: 33 feet/10 meters (No obstacle between)
Liquid Rate: IPX7
Standby Time: 250 hours
Charging Time: 2 hours
Talk/Playing Time: about 8-10 period (Varies according to volume level and audio content)
Charges Voltage: DC 5V
Download Current: 5V 1A
Battery Capacity: 100mAh/3.7V FITNIV U8I Bluetooth Headphones Your Manual