P.M.P.O 300Watts RMS 2.5W x 2 Drivers Unit 1.25 x 1.25 inch, Full Range Magnetically Shielded Unit Frequency Response 80Hz~20KHz Input Sensitivity 300~500mV, RMS for rated power output Controls Power ON/OFF Master Vol Headphone Jack Dimension 55x93x192mm (WxDxH)