Features: Compact size compressor pedal, aluminum alloy shell, lightweight and durable. 2 compress modes: NORMAL/ TREBLE, selected by the toggle switch. With compression intensity, output volume and tone control knobs. True bypass, and with LED light for indicating effects or bypass status. Specifications: Material: Aluminum Alloy Input: 1/4" Monaural Jack (Impedance: 470K Ohms) Output: 1/4" Monaural Jack (Impedance: 1K Ohms) Power Supply: DC 9V (plug polarity is negative in the center) Working Current: 12mA Item Size: 3.8 * 9.5 * 3.5cm / 1.5 * 3.7 * 1.4in Item Weight: 210g / 7.4oz Package Size: 12 * 6.5 * 6.5cm / 4.7 * 2.6 * 2.6in Package Weight: 286g / 10.1oz Note: Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual (English & Chinese)