Features: With this speed controller, there is no waste of energy The controller come with Switches function. High power speed controller Switches which is much more adaptable and convenient to change the motor direction The rotary knob provides precise Voltages control, while the Voltages display ensures easy monitoring The flame-retardant casing provides additional layer of protective Suitable for powering fan, small motors, soldering irons, and other inductive load devices Specifications: Component:ABS Working Voltages: 6-20V (limit 24V) Drive current: 30A plus air cooling 50A Power: 1000W Size:Approx.99x36mm/3.9x1.42inch Package Includes: 1 Set Drive Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.