Mosky DYNAMIC COMPRESSOR pedal Guitar effect Pedal COMP True Bypass Dyna Compressor Based on MXR DYNA COMP 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: 125g Note: Power supply not included. Please use a 9V DC power adapter whose polarity is negative center otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual ( English ) 1 * Year warranty through our store No Duty to Canada and USA FAST 'N FREE USA Shipping (typically about 4 days) Ships from Canada (depending on stock availability, may also ship from our Niagara Falls NY. location) *Just to be clear on DUTY, (regardless of what warns buyers of ) Canada and the USA have a trade agreement in place that allows US citizens to purchase/import up to $800 dollars per purchase in to the United States from Canada with NO Duty at all, State taxes are another story, some states charge a TAX some do not, BUT NO duty.