Features: Based on the MXR dyna compressor. Single knob control to adjust the degree of compressor sensitivity. Run a cable from your guitar to the Dyna Comp's input jack and run another cable from the Dyna Comp output jack to your amplifier. The light flashing when working. True bypass in order to protect signal integrity when the pedal is not engaged. Foot-switch toggle controlling on/off condition. Specifications: Material: Zinc-Aluminium Alloy Model: Dyna Input Impedance: 1M ohm Output Impedance: 10K ohm Working Current: 20mA Nominal Input Level: -5dBV Nominal Output Level: -12dBV Noise Floor: 95dBV T.H.D: 0.2% Typ.at: -20 dBV,1K Hz Max Compression: 36dB Attack Time: 5 ms Release Time: 1s Power Supply: 9V DC (Not included) Item Size: 9.2 * 3.8 * 3.6cm / 3.6 * 1.5 * 1.4in Item Weight: 126g / 4.5oz 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) No Tax No Duty to Canada and USAFree USA Shipping