XO brands Version of Bluetooth: V5.0+BR+EDR+BLE HFP, A2DP, VARCP, and HSPV wireless support Working distance: 10 meters Sensitivity: +0.1% -80dB<_ BER range of frequencies: 20 Hz–20 kHz Six to eight hours of music Talk time: seven to nine hours Waiting period: 300–400 hours 250mA lithium-ion battery 3.5 mm wired audio input