Specifications Controls: Volume, Gain, Bass, Treble Connectors: 1/4-inch jack x 2 (INPUT and OUTPUT), DC 9V input jack (AC adapter jack) Power Supply: 9V battery or AC adapter DC 9 volt 100mA ~ Dimensions: 67 (W) x 115 (L) x 43 (H) mm Weight: 310 grams approx. (Not including battery)