Features: Mini and portable, and hard metal shell is stable and durable. The TONE Knob: to control the amount of high frequency. Once you give a clockwise rotation to it, the voice will become more and more pitched, on the contrary, you rotate it anti- clockwise and will decrease the frequency. The GAIN Knob: to adjust the amount of distortion. Clockwise adjusting direction is increasing the distortion degree and anti-clockwise direction is reducing it. The LEVEL Knob: to manage the level of signal. the adjusting principle is the same as the above two. While the effect pedal is in work condition, you can adjust the corresponding effect volume via this knob. Standard 6.35 mm side output and input jack fits for most connectors. Classic distortion tone effect pedal for your guitar. Specification: Condition: 100% Brand New and High Quality Material: Metal + Electron Color: Red Jack: 6.35 mm / 0.25 inch Power Supply: External 9V battery or AC 9V adapter Dimensions(L x W x H): Approx. 110 x 70 x 50mm / 4.33 x 2.75 x 1.97inch Weight: Approx. 277g Packing List: 1 x Guitar Effect Pedal 1 x Cable 1 x Sticker 1 x User Manual Note: Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.