Features:- -Made of high-quality materials, -Motor speed controller allows you to control the speed and direction of rotation of the motor.-With forward and reverse two-way two-way switch.-Digital display is 0-100 percent of the full motor speed, not the actual motor speed-Input voltage should be equal to the rated voltage of the motor between 10-55V DC -Make sure the positive and negative connections are correct before turning on Power. Do not touch the heat sink with wiring that may burn the circuit board. Please note that this is not a power module, it needs to be connected to the motor to adjust the speed, the output of the multimeter will not change without the motor, and it cannot be connected to AC power. Product Parameters:Input Voltage: DC10-55V Output Voltage: Linear Load Input Current: Must Be Greater Than Motor Working Current Output Current: Determined by the Magnitude of the Load Maximum Current: 60A Continuous Current: 40A Maximum Power: 2000W (Supply Voltage × Current) Knob Hole: 7mm Speed Control Method: Potentiometer (Linear) Speed Control Mode: ON\OFF 270 Degree Linear Potentiometer Speed Range: 0- Operating Frequency: 15KHw Forward and Reverse: Support Size Body: 110mm×78mm×38mmProduct Net Weight: 230 gramsPackage List:1*Motor Speed ControllerNotes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.