... 87(W)*86mm(D) Mini speaker: Features/Specifications: Output power1.8+1.8W (THD<=10%Distortion<0.5% (1KHz, 0.5W ... ratio>80dB (A-Weight)Frequency response90Hz-20kHzPower supply4 AA , USB power , AC adapter DC5VDimensions207mm(L) , 87mm(W), 86mm(D)Weight800g3 ... plug in your alternating current.b. Power is turned on: the power adapter connected, press the power switch button click, machine startup, LED ...