Features: 1.There are four main control knobs on the pedal, which is gain, treble, volume and bass 2.Gain can change you from a barely noticeable enhancement to a blurry enhancement. Treble and bass control is a great way to further reduce and increase the frequency 3.Combine of these controls can achieve a variety of functions, very useful and practical 4.Aluminum alloy shell with higher strength, specific strength is close to high alloy steel, specific stiffness exceeds steel, possess good corrosion resistance 5.Come with small size and excellent quality, portable and easy to carry, save much space specification:Item Type: Overdrive 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 x Overdrive Pedal 1 x Battery Cable 1 x Overdrive Pedal Footpad