Power supplier:DC5V 
Output power:3W
Frequency:90Hz-20KHz
Signal&noise ratio:≥60dB
Impedance:4 OHM(Ω)
Li-ion Output:3.7V~4.2V+0.05V 
Li-ion Input:5V
Lithium battery:200mAh
Speaker Unit:50mm
Case Material:ABS
Color:Can be customed.