1)Output power: the RMS 2W THD = 10% 2)speaker: 45mm outer diameter, magnetically shielded 4 Europe 3)external USB ... , FM, MP3 function.3)signal to noise ratio: ≥ 70 dB4)speaker: 45mm outer diameter, magnetically shielded 4 Europe5)external USB cable6 ... computer, the headphone output holeBuilt-in lithium battery) music angel speaker