ConnectivityTuner AM FMMedia BluetoothBluetooth 5.2 A2DPDesign Display BacklightDimmer Battery Low LED IndicationDial Scale Charging IndicatorDimensions (mm / in) 134 x 82 x 78.71 / 5.28 x 3.23 x 3.1Weight (g / lb / oz) 437 / 0.96I/O Interface DC-In (Type-C)Earphones FM Ext. Antenna (3.5mm Jack)Accessories FM Wire AntennaUSB A to USB C CableOthers RechargeableSpeaker Configuration 2 inchesAmplifier Class AB Class D Impedance 4 ohmsOutput Power 1.8W AM & FM / 4.75W BTBattery Output Power 1.3W AM & FM / 4.2W BTEarphone Output Power 1mW x 2Audio Decoding SBCPower Supply DC-in 5V / 2.4ABattery / Backup Battery 18650 Li-Ion Battery 3.7V / 3350mAhRechargeable Battery Capacity 3350mAhPlaytime 54 h (Speaker playback time on built-in battery