This DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse Width Modulation(PWM). It's great for applications like car wiper motor, exhaust fan, etc. providing nice adjustment of motor speed. Industrial design, 200A high current, continuous working current can reach 100A. Positive inversion of motor control, pure silver contact relay can bear larger current. 0-5V analog signal voltage control the rotate speed. With forced cooling fan to solve the heating problem of high current operation. Programmable design is great for function development. Applications: 1. Various types of universal- brush DC motor speed 2. Various types of vehicles motor to adjust speed(automotive cooling fan speed, auto fan speed, auto wiper motor speed, automotive air-conditioning fan speed) 3. The production line belt speed, pipeline exhaust fan speed, treadmill speed, multiple computers in parallel fan speed control, electronic fan speed control 4. Various types of DC lamp dimmer, various types of DC heater thermostat, etc. Specifications: Working Voltage: DC 10V-50V Max. Current: 200A(max. continuous working current 100A) Control Power: 0.01-5000W Static Current: 0.05A PWM Duty Cycle: 0%-100% PWM Frequency: 15KHz Control Voltage: 0-5V Operating Temperature: -20 to 40C Size: 23.5 x 11.5 x 6.5cm / 9.25 x 4.53 x 2.56in Colour: silver Material: metal Package Contents: 1 x DC Motor Speed Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.