This is a PWM speed controller, so it allows you to smoothly control the speed of those low-speed DC brushed motors. 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 case Creates increased durability; High efficiency and low noise. Suitable for applications such as fans, etc., providing good motor speed adjustment. Notice: 1. This inverter is suitable for DC brush motors, not DC brushless motors; it cannot be used as a voltage regulator. 2. It must be connected to DC voltage, do not connect with AC voltage (e.g. 220V AC). 3. The anode and cathode of DC current cannot be connected inversely, otherwise the controller will be damaged. 4. When the running 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: Operating Voltage: DC 12V/24V/36V/60V Rated Current: 8A Max. Current: 10A Control Power: Max. 400W Speed adjustment range: 10%-100% PWM frequency: 21 KHz Item size: 90 * 40 * 3 mm / 3.54 * 1.57 * 1.18 in Item weight: 79 g / 2.8 oz Package List: 1 * DC Motor Speed Controller