Hileo Hi70 Air Conduction Earphone Model number: Hi70 Bluetooth version: V5.0 Bluetooth protocol: A2DP, AVRCP, HFP, HSP Bluetooth wireless distance: 10m Transmission frequency: 10Hz-20kHz Continuous call time: about 10 hours Music time: about 10 hours Standby time: about 140 hours Charging time: about 2 hours Battery capacity: 140mAh Charging port: Type-C