Power output RMS 2.5WX2(THD=10%) .Signal-to-Noise Radio(Amplifier):>=70dBA .sensitivity:87dB .Connector type:USB .Frequency Response:80Hz-20KHz .Speaker driver:2 inch(52mm),magnetically Shielded,4 ohm. .Power required:By USB connection DC,+5V Dimensions:2.68"(W) X 4.72" (H) X 1.57"(D) Weight:approx 1.10 Ib.