Features: 1.Use the sustain, attack and volume knobs to find the ideal pitch. Tweek Attack can improve the bottom end and stabilize high output pickups 2.Using aluminum alloy shell, aluminum alloy has higher strength, specific strength is close to high alloy steel, specific stiffness exceeds steel 3.Compressor pedal possess good corrosion resistance, so the material of this product is very good 4.Adopt True bypass design, minimizes tone loss, this overdrive pedal is very useful and practical 5.This effect device is small in size, light in weight, easy to carry, suitable for external performances, and equipped with a DC 9V battery cable specification:Item Type: Compressor Pedal Material: Aluminum alloy shell Power Requirements: 9V DC center negative(not include) Current Consumption: 30mA Product Size: Approx. 11.2 x 6.4 x 3.4cm / 4.4 x 2.5 x 1.3in PackageList: 1 xCompressor Pedal 1 x Battery Cable 1 xCompressor Pedal Footpad