Specifications: Rated current: 40A (maximum output current) Power requirement: 1050VDC. Frequency: 12000HZ Control motor power: 0.012000W. Operating voltage 12V: 480W (max); Operating voltage 24V: 960W (max); Operating voltage 36V: 1440W (max Package Included: 1 x DC Motor Speed Control Package List 1Flexible installation, the external potentiometer can be installed to any location for long-distance operation according to actual needs. 2This DC motor speed controller can be widely used in controlling the speed of a fan/pump/other DC load, or to dim the brightness of DC lamps or LEDs. 3This DC motor speed controller is made of high quality material, durable in long time usage. 4The motor Speed Controller allows the use of pulse width modulation (PWM) DC voltage to control the direction of the DC motor. 5This motor regulator has passed many safety tests and is safe and reliable. You can use it with confidence.