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: 1/4" mono jack (impedance: 470 k) Output: 1/4" mono jack (impedance: 1 k) Power Requirements: 9V DC Power Supply Current Consumption: 10mA Item Size: 9 * 3.5 * 3.2 cm / 3.5 * 1.4 * 1.3in Product Weight: 146 g / 5,2 oz Package Size: 10,5 * 6 * 4,6 cm / 4,1 * 2,4 * 1,8 inch Package Weight: 169g / 6oz List of packages: 1 * Optical compressor pedal 1 * User Manual (English and Chinese)