Guitar compressor effect pedal. One pedal that should not be missed is the COMPRESSOR. Whether live or in the studio, the compressor helps to make your sound even more perfect. Use the level, tone, attack or sustain controls to modify your personal sound. It has 6,3 mm jack input and output. Power: 9V AC adaptor (not included) or 9V battery. Dimension: 59 x 110 x 34 mm. Weight: 310 g