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. Features: Electric guitar dynamic compressor effect pedal for guitar players. 2 functional knobs(OUTPUT/SENS) for adjust the performance of compression. True bypass footswitch for switching between compressor and bypass status. LED light for indicating effects or bypass status. Full metal shell and compact size, durable and portable. Specifications: Input: 1/4" monaural Jack Output: 1/4" monaural Jack Power Supply: DC 9V AC adapter (center minus plug)(not included) Item Size: 9.3 * 3.8 * 3.2cm / 3.7 * 1.5 * 1.3in Item Weight: 140g / 4.9oz Note: Power Adapter is not included. 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: 125g No Tax No Duty to Canada and USA