Compression is perhaps one of the most useful and versatile effects available to any guitarist who is interested in improving their tone. The purpose of the Compressor pedal is primarily to allow you to modify the sustain and attack of your guitar sound. Using classic variable gain techniques the Compressor will provide masses of clean sustain, which you can utilise whatever your style. The Compressor pedal senses the level of the incoming guitar signal and as the signal level decays the gain of the internal circuitry is boosted to provide extra level and hence sustain.Technical Specification Power: 9V DC Centre Negative Regulated Current Draw: 5mA Controls: Emphasis Mode Select, Volume, Attack, Compression Switches: On/Off Switch Indicators: On/Off LED Jacks: Input/Output ‘Jacksockets’ Input Impedance: > 1M½ Output Load Impedance: < 20k½ Dimensions: 120mm x 65mm x 55mm Weight: 510 grammes