Bluetooth version: Bluetooth V 5.0 Audio decoding: SBC Effective distance: 10m Working hours: about 6h (earphone) +24 hours (charging box) Charging time: about 1.5h. Rated input: DC 5V 50mAh (headphone) DC 5V 1200mAh (charging box) Frequency response range: 20Hz-20KHz Sensitivity: 98dB