FONENG BL 12 WIRELESS SPEAKER BLUETOOH Specification Bluetooth : 5.0 Play time : 4 hours Battery capacity : 1200mAh Support reading TF CARD : MP3 Transmission distance : 10 meters Output maximum power : 2*5W Signal to noise ratio S/N : 90dB Frequency response range : 20Hz-10KHz Rated voltage : 3.7V DC Battery : Li-on polymer battery , 3.7V/1200mA Charging voltage : 5V 0.25V Charging time : 3 hours