Features: Full metal shell, durable and exquisite.  The powerful little unit with nice attack and sustain and does not color the original response.  4 controlling knobs are accurate, high sensitive.  Mix knob for mixing ratio for original signal & compressor signal.  Attack knob for attacking response time adjustment.  Level knob for outputting level control.  Comp knob for compressor sensitivity adjustment.  An unique plastic cover to protect knobs from accidental movement and also protects from dust, spills, etc.  True bypass in order to protect signal integrity when the pedal is not engaged.  LED light on when working.  Foot-switch toggle controlling on/off condition.  2 stickers for fixing guitar effect on performance panel and protect it from being scratched.    Specifications: Material:Zinc Alloy;  Color:Blue;  Effect:Compressor;  Input Impedance:1M Ohms;  Output Impedance:10k Ohms;  Working Current:10 mA;  Power Supply:9V DC Adapter (not included);  Item Size:7.3 * 3.7 * 4cm / 2.9 * 1.4 * 1.6in;  Item Weight:219g / 7.8oz;  Package Size:10 * 6.5 * 7cm / 3.9 * 2.6 * 2.8in;  Package Weight:304g / 10.7oz;    Package List: 1 * Guitar effect pedal;  1 * Hardcover box;  2 * Stickers;    Note: Item color displayed in photos may be showing slight difference on your computer monitor due to the light or different monitors