1、High performance. No noise, high power and high efficiency. 2、With forward reverse switch. Adjust the speed and direction easily. 3、Control and adjust the speed of a DC motor with this controller. 4、Light weight, heavy current, wide voltage. 5、High reliability. High torque, low heat generation. The DC motor speed controller can not only control the speed, but also the direction of a DC motor using a PMW DC voltage. Features: High performance. No noise, high power and high efficiency. With forward reverse switch. Adjust the speed and direction easily. Control and adjust the speed of a DC motor with this controller. Light weight, heavy current, wide voltage. High reliability. High torque, low heat generation. Specification: Working Voltage: DC 12V-40V Maximum Output Power: 120W Maximum Continuous Output Current: 3A PWM Frequency: 15kHz Duty Cycle Adjustable: 0-100% The Operation Environment Temperature: -20°C-40°C Material: Aluminium Alloy Item size: 9 * 3.8 * 3cm / 3.54 * 1.5 * 1.18in(L * W * H) Item weight: Approx. 69g / 2.43oz Package size: 14.6 * 10.3 * 3.5cm / 5.75 * 4.06 * 1.38in(L * W * H) Package weight: 71g / 2.5oz Package list: 1 * DC Motor Speed Controller Note: It can NOT be used to the BRUSHLESS motor. 1 * DC Motor Speed Controller Note: It can NOT be used to the BRUSHLESS motor.