Bluetooth version : Bluetooth V5.0 Bluetooth profiles : HSP, HFP, A2DP, AVRCP Effective distance : 10m Input : DC5.0V 1A Playback time : Approx. 25 hours Charging time : Approx. 4 hours Frequency response : 20Hz-20KHz Sensitivity(SPL) : 100dB Impedance : 24Ω