1、Mini and portable, and aluminum alloy shell is stable and durable. 2、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. 3、The GAIN Knob: to adjust the amount of distortion. Clockwise adjusting direction is increasing the distortion degree and anti-clockwise direction is reducing it. 4、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. 5、The LED indicator shows the working state, powered by AC adapter(not included) 2-stage distortion design provides higher degree of distortion. Features: Mini and portable, and aluminum alloy 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. The LED indicator shows the working state, powered by AC adapter(not included) 2-stage distortion design provides higher degree of distortion. 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: Aluminum Alloy + Electron Color: Red Brand: KOKKO Model: FDS2 Jack: 6.35 mm / 0.25 inch Input Impedance: 1M Ohms Output Impedance: 10K Ohms Power Supply: External AC adapter(not included) delivering 9V DC regulated minimum 300mA Dimensions(L x W x H): Approx. 94 x 51 x 53 mm / 3.7 x 2.0 x 2.1 inch Weight: Approx. 213 g Packing List: 1 x Guitar Effect Pedal 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.