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 AlloyInput: 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: 12mAItem Size: 3.8 * 9.5 * 3.5cm / 1.5 * 3.7 * 1.4inItem Weight: 210g / 7.4ozPackage Size: 12 * 6.5 * 6.5cm / 4.7 * 2.6 * 2.6inPackage Weight: 286g / 10.1ozNote: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 Pedal1 * User Manual (English & Chinese)