Classic Dynamic Compressor Creates infinitely clean sustain. It uses a signal-limiting processor that varies its gain so that the output signal stays constant. Designed to level the output signal of your playing, The compressor guitar effect pedal stabilizes the dynamics of the output signal to create clean sustain. The two knobs of this compressor guitar effect pedal allow you to control output level and sensitivity. The COMP ensures that your playing remains smooth. True bypass switch 100% analog signal path On/Off LED indicator Dimensions (L/W/H): 94(L)MM x 39(W)MM x 32(H)MM Power: 9VDC, Negative Tips (Regulated recommended) Weight: 165g