1、It has multiple holes shell for heat dissipation, good heat dissipation and long service life. 2、The potentiometer is used for speed regulation, which is simple and easy to use. 3、The DC motor speed control module is made of high quality electronic components, which has high stability and can maintain high stability in harsh environments. 4、The speed control module can achieve a large adjustment range of 0-100%. 5、Equipped with indicator light and switch, it is very convenient to operate. Feature: It has multiple holes shell for heat dissipation, good heat dissipation and long service life. The DC motor speed control module is made of high quality electronic components, which has high stability and can maintain high stability in harsh environments. The potentiometer is used for speed regulation, which is simple and easy to use. The speed control module can achieve a large adjustment range of 0-100%. Equipped with indicator light and switch, it is very convenient to operate. Specification: Model: CCM6DS Applicable voltage: 12V-50V DC (wide range) Applicable current: 30A Power range: up to 1500W, recommended 12V/250W, 24V/350W, 48V/500W. Potentiometer: resistance value B100K, opening 8mm Speed range: 0%-100% Product frequency: 21KHz Dimensions (length * width * height): 110*76*35mm / 4.3*3* 1.4in Weight: 203g / 7.2oz Package list: 1 * Motor Speed Controller Note: This speed governor is used for DC brushed motors. Not suitable for speed regulation of DC brushless motors; nor can it be used as a regulator or regulator. Can not use 48V storage battery power supply (48V storage battery full charge and voltage will exceeds 50V) This is not a power module. It must be connected to the motor to speed it up. There is no change in the output of the multimeter without the motor. The motor can be connected without any positive or negative. When the running direction is inconsistent with the expectation, the direction can be changed by adjusting the line sequence. The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.