Brief Description: Chipset Model JL6973 Bluetooth Version 5.3 Bluetooth Audio Protocol HFP, HSP, A2DP, AVRCP, SPP, PBAP, TWS+ Bluetooth Distance 10m/33ft (Depends on mobile phone function) Music Time 6-7 hours Battery Box Time 14 hours Type-C Charging Port Earphone Charging Time 1 hour Charging Time 2 hours Earphone Battery Capacity 3.7V/35mAh Battery Box Battery Capacity Li-ion 3.7V/230mAh