Bluetooth version: 5.3.Bluetooth protocols supported: AVRCP, HFP, A2DP.Music connector: mini Jack 3.5 mm (AUX-out).Power supply: 5 volts via USB connector.Cable length: 34 cm coiled cable / 86 cm extended cable.Voice support: Google Assistant, Siri.Compatibility: devices equipped with AUX input/jackFrequency bands in which the radio equipment operates: Bluetooth: 2400 2483.5 MHzMaximum radio-frequency power transmitted in the frequency band in which the radio equipment operates: Bluetooth: 4 dBm