This is a PWM speed controller, so it allows you to control the speed of those little DC brushed motors smoothly. It is ideal for applications like fans, etc. offering nice motor speed adjustment instead of the more usual "High-Low" switching. Features: Wide operating voltage range: 12V, 24V, 36V, 60V, Max. power: 400W. A good controller for DC brush motors. Capacitance tube High-frequency, power and 10A fuse are used in the module. Adopts high-quality sealed potentiometer with switch, stable performance. Metal housing Creates increased durability; high efficiency and low noise. suitable for applications such as fans, etc., providing the correct speed adjustment of the motor. Notice: 1. This inverter is applicable to DC brush motor, not DC brushless motor; it can not be used as a voltage regulator. 2. It must be connected to DC voltage, do not connect with AC voltage (such as 220V AC). 3. The anode and cathode of DC current cannot be connected reversely, otherwise the controller will be damaged. 4. When you run direction is inconsistent with your desire, you can change it by adjusting the linear order. 5. Potentiometer switch can change the output cycle of the controller and then change the motor speed. Specifications: Working voltage: DC 12V/24V/36V/60V Rated current: 8A Max. Current: 10A Control power: Max. 400W Speed adjustment range: 10%-100% PWM frequency: 21KHz Item size: 90 * 40 * 3mm / 3.54 * 1.57 * 1.18in Item weight: 79g / 2.8oz Package List: 1 * DC Motor Speed Controller