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 rotationto 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 isincreasing 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 abovetwo. While the effect pedal is in work condition, you can adjust the corresponding effectvolume via this knob. Standard 6.35 mm side output and input jack fits for most connectors. Classic distortion toneeffect pedal for your guitar. Specification:Condition: 100% Brand New and High QualityMaterial: Metal + ElectronColor: RedJack: 6.35 mm / 0.25 inchPower Supply: External 9V battery or AC 9V adapterDimensions(L x W x H): Approx. 110 x 70 x 50mm / 4.33 x 2.75 x 1.97inchWeight: Approx. 277gPacking List:1 x Guitar Effect Pedal1 x Cable1 x Sticker1 x User Manual Note:Please use the 9V power adapter whose polarity is positive pole outside and negative poleinside. Otherwise, the product may not work properly.