Adaptability Android IOS Battery input voltage DC 3.2 4.2v Charging input voltage DC 5V 0.25V Charging current 30mA Wireless distance 9 15m Bluetooth frequency 2.402ghz 2.4830ghz ISM band RF output power 6 8dbm Service temperature 50 Storage temperature 60 Working time 4 hours Playback time 3 hours Bluetooth specification Bluetooth V5.2 dual mode