Bluetooth version: Bluetooth V5.0, Bluetooth profiles: A2DP, AVRCP, HFP, Audio decoding: SBC, Effective distance: 10m, Playback time: 64H, Charging time: About 1.5H, Input: DC5.0V@500mA, Frequency response: 20Hz-20KHz, Sensitivity (SPL): 97dB, Nominal impedance: 32 Ohm. Free from constraints, excellent communication anytime, anywhere. Clearer calls, smarter office and more efficient work.