Lightweight, portable and big sound. 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: 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 Max Compression: 36dB Attack Time: 5 ms Release Time: 1s Power Supply: 9V DC Charger (Not included) Colour:Orange Material:Zinc aluminum alloy Size:9.2*3.8*3.6cm Package Contents: 1 * Guitar Effect Pedal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.