Functions: Classic optical compression sound with smooth attack and fade, perfectly preserves the original signal transients. A real workaround project. Mini and great look. Aluminum alloy housing. Knobs Comp, EQ, Volume control: Comp: Adjust compression intensity EQ: Adjust the tone of sound Volume: Adjust the output volume. Technical data: Colour yellow Suitable for: Electric Guitar Material: Aluminum alloy and PCB Input: 1 or 4" mono jack (impedance: 470 kΩ) Output: 1 or 4" mono jack (impedance: 1 kΩ) Power Requirements: 9V DC Power Supply Current Consumption: 10mA Item Size: 9 x 3.5 x 3.2 cm or 3.5 x 1.4 x 1.3in Product Weight: 146 g or 5,2 oz Package Size: 10,5 x 6 x 4,6 cm or 4,1 x 2,4 x 1,8 inch Package Weight: 169g or 6oz List of packages: 1 x Optical compressor pedal 1 x User Manual (English and Chinese)