The main features of the Marshall JH-1 JACKHAMMER include: Create your own truely awesome, extreme Marshall distortion tones Overdrive and Distortion mode switch Volume/Gain control Bass/Treble control Contour Level/Contour Frequency Solid metal casing Passive bypass Power: 9V DC Centre Negative Regulated PSU or PP3 battery Current Draw: 13mA Switches: On/Off Switch Indicators: On/Off LED Jacks: Input/Output 'Jack sockets' (1/4 inch) Input Impedance: 1MOhm Output Load Impedance: less than 20kOhm Dimensions: 120mm x 65mm x 55mm Weight: 510 grammes