Model: Small block S01 Chip: Jely 6973D4 Bluetooth Low Power Version: 5.2 Support Protocol: HSP/HFP/A2DP/AVRCP Charging interface: Type-C Input current: DC 5V Output current: 3.7V/50mAh Speaker: 13mm High quality moving coil Frequency response Range: 20Hz-20000Hz Headset battery: 30mAh *2 Charging box Battery capacity: polymer 300mAh with protection board Music playback:, about 5-6 hours per play, about 12 hours with charging box Talk time: 4-6 hours Charging time :60 minutes Wireless working range :≤15M(no obstacles)