It is fit all kinds of general- and have a DC motor speed with brush. All kinds of automobile motor car, (car wiper, car fan control cooling fan control, automobile air-conditioning fan speed control motor speed) Conveyor belt of the production line , pipe exhaust fan speed control and running machine control of motor speed, multiple computers parallel speed control, electronic fan speed control. All kinds of dc lamp was dimming, all kinds of dc heater adjust the temperature,This speed governor is the grade quality for the industrial , can work in freezing environment. Working voltage: DC9V- DC 50V Max instantaneous current: 40A Output power : 0.01-2000W (max) Recommended use range:12V 250W;24V350W;36V 400W;48V 500W Quiescent current:0.025A PWM Regulation range:5-100% PWM Frequency : 200hz operating temperature: -40°C~+85°C (40º F-185º F) Colour:Black Material:Plastic+PCB+electronic components Package Contents: 1 x DC Motor Speed Control PWM HHO RC 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.