Features: 1. Using CW or CCW switch, potentiometer knob with switch, you can use PLC to control 2. Good build quality and stable performance. 3. High speed and high efficiency. 4. Small size, easy to carry and convenient to install 5. Made of high quality, durable and durable. Specification: Item Type: PWM DC Motor Speed Controller Input voltage: DC10-55V (equal to the rated motor voltage) Output voltage: linear under load Maximum current: 80 A Continuous current: 40 A (use for a long time to pay attention to heat dissipation or reduce current) Speed control type: current adjustment Speed control mode: potentiometer (linear) Auxiliary motor: DC brush motor CW or CCW: support Speed Range: 0 - 100 percent Control Frequency: 15 KHZ Wiring Type: Clamp Knob specification: 100 K (with switch) Wiring Type: Fence Terminal Block Size: approx. 100 x 76 x 28 mm or 3.9 x 3 x 1.1 inch List of packages: 1 x PWM DC Motor Speed Controller 1 x Knob Cap 1 x Seal 1 x Nut 1. Digital display shows the percentage of full motor speed 0-100 without actual motor speed 2. Input voltage must be positive and negative 3. The input voltage is equal to the rated voltage of the motor in the range of 10 to 55 V DC. 4. Please be aware: