1、Flexible installation, the external potentiometer can be installed to any location for long-distance operation according to actual needs. 2、This 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. 3、This DC motor speed controller is made of high quality material, durable in long time usage. 4、The motor Speed Controller allows the use of pulse width modulation (PWM) DC voltage to control the direction of the DC motor. 5、This motor regulator has passed many safety tests and is safe and reliable. You can use it with confidence. Specification: ‑ Power requirement:10‑50VDC ‑ Rated current: 40A（Maximum output current） ‑ Frequency : 12000HZ ‑ Control Motor Power : 0.01‑2000W, ‑ Regulation range:5‑100% ‑ Size: Approx.90 x 51 x 32mm (L x W x H) Package Includes: 1 x Motor Speed Control PWM HHO RC Controller