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. This motor speed controller would change direction of rotation that accomplishes reversing motor's direction. Convenient to use, simply rotate the knob to change output so to change the revolving speed of brushed motor. Designed with convenient screw terminals for quick wire connection. Specification: Applicable Motor: Brushed motor Input Voltage: DC 6V 12V 24V Maximum Current: 3A Size: Approx. 50*32*15mm/2*1.3*0.6inch Weight: Approx. 34g / 1.2oz Package List: 1 x PWM Motor Speed Controller Note: Connected to DC power supply, don't directly connect household 220V alternating current. This is NOT a power module, motor must be connected to motor to control speed, the multimeter output will not change without motor. This governor is used for DC brushed motor. NOT suitable for speed adjustment of DC brushless motor; NOR can it be used as a voltage regulator or stabilizer.