Features High efficiency: The high-performance DC motor speed controller has many advantages, such as large power, low heat generation, high efficiency, large torque, and low noise. Stable performance: The DC brushed motor speed controller has stable performance and is easy to use. The working voltage is 12-40V DC (the output voltage is about 0-100% of the input voltage), the rated current is 3A, and the maximum current is 5A Screw terminal design: The speed controller adopts the screw terminal design, which is fast and convenient for wiring, and is made of high-quality circuit boards, which makes the use more smooth and has a longer life. Switch function: The motor speed controller has a switch function and can also realize CW/CCW rotation control. The PWM frequency is 15KHZ, the resistance of the potentiometer is B100K, and the opening is 8mm Size: The size of the motor governor (length x width x height) is 73 x 39 x 31 mm / 2.9 x 1.5 x 1.2 inches, and the weight is approximately 74 grams / 2.6 ounces. The speed regulator is not suitable for DC brushless motors, nor can it be used As voltage regulator Features:  This is a simple and easy-to-use DC brushed motor speed controller of elegant appearance and stable performance. Speed controller is made with high quality circuit board which ensures a longer service life. Designed with screw terminals for quick and convenient wire connection. This motor speed controller has switch function, and can also accomplish CW/CCW rotation control. High performance DC motor speed governor has large power, small heating, high efficiency and high moment of force, while no loud noise. Specification: Working Voltage: 12-40V DC (output voltage is about 0-100% of input voltage) Control Power: 12V=36W, 24V=72W....40V=120W Rated Current: 3A Maximum Current: 5A Speed Control Range: 0-100% PWM Frequency: 15KHZ Potentiometer: Resistance B100K, opening 8mm Size(L x W x H): 73 x 39 x 31mm / 2.9 x1.5 x 1.2in Weight: 74g / 2.6oz (approx.) Package list: 1 x Speed Controller Note: 1, This speed controller is used for DC burshed motor. 2, It is not suitable for DC brushless motor; can not be used as a voltage regulator or voltage stabilizer. 3, Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List