Rotate sustain, attack, level, clipping4 knobs to adjust and control for desired sound. True bypass provides pristine tone and perfectly retains the guitar's natural sound. Solid durable aluminum alloy shell with silver coating, rust-resistant and long-lasting; sleek, classic, simple design. Compact compressor guitar effect pedal, pocket-sized, lightweight, easy to carry. Works stably and effectively reduces dynamic range, making tracks sound more polished with a smooth, rounded tone. Note: Compressor only. DC 9V power adapter and other accessories shown are not included. Color: Silver Material: Aluminum Alloy Size: 94x39x32mm / 3.70x1.53x1.25 inch Package Contents: 1 x Guitar Effect Pedal Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause slight color variation between the item and the image. Measurement error allowed is +/- 1-3 cm.