Pulse WidthModulator DC Motor Stepless Variable Speed Controller 20A DC9-60V Features: 1. 2. Made of material, durable and long service life 3. Adopt the speed control mode of potentiometer, it has stable performance. 4. The adjustable speed range is from 0%-100% 5. Widely used in industrial DC motor speed regulation, industrial conveyor belt speed regulation, lighting and lighting mediation, computer power supply cooling, DC fan, etc.   Specification: Condition: Maximum Current: 20A Controller, Continuous Current: 10A Speed Range: 0%--100% Control Frequency: 15Khz Speed Control Mode: Potentiometer (with switch) Speed Control Type: Flow Adjustment Support Motor: DC Brush Motor Wiring Type: Wire Installation Size: Center Distance 104mm Size: Approx. 90 * 52 * 36mm / 3.5 * 2 * 1.4in Weight: Approx. 125g / 4.4oz   Package List: 1 * Motor Speed Controller   Note: 2. The input must distinguish between positive and negative polarity. 3. The motor can be connected without negative. When the running direction is inconsistent with the expected direction, the direction can be changed by adjusting the motor wire sequence.