Mosky Roller Compressor Guitar Pedal,4 Modes Compress effect with Sustain/Blend/Level/Tone Button,Compressor Pedal SUSTAIN: Adjusts compression ratio and increases SUSTAIN. NOTE :Higher Sustain Setting will create noise whe not playing . BLEND: Adjusts mix of compressed and uncompressed signal.Full left for 50/50 blend ,full right for full compression. LEVEL: Adjusts for gain lost to Compression or Blend, Set to unity or turn it up higher for a boost effect. TONE: Adjusts brightness of output turn right for bright. Control: SUSTAIN,BLEND,LEVERL,TONE 4-MODE SELECTION KNOB True Bypass Power Supply: 9V DC power -Center Negative Packing Size: 147 (W) x 78 (D) x7(H) mm Weight:300g 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.