A re-creation of the classic Ross compressor, with very low noise. Use the Sustain, Attack, and Level knobs to find your ideal tone. Sustain: To control the delaying time of compressing; Attack: To control the starting time of compressing effect; Level: To control the output level. The Attack is especially designed for Bass or high-output active pickup. True bypass design minimizes tone loss. Aluminum alloy casing with stove varnish finish. Powered by a 6FF22 9V battery or 9V DC power adapter (neither included). Specifications: Color: Green Effect pedal size: 11.8 * 6.4 * 3.8cm / 4.6 * 2.5 * 1.5in Effect pedal weight: 300g / 10.6oz Package size: 13 * 7.7 * 6cm / 5.1 * 3.0 * 2.4in Package weight: 330g / 11.6oz Note: Power supply not included. Please use the 9V power adapter whose polarity is negative center otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English Chinese) 1 * Year warranty through our store No Duty to Canada and USA FAST 'N FREE USA Shipping (typically about 4 days) Ships from Canada *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.