It is fit all kinds of general-purpose and have a DC motor speed with brush.<br> All kinds of automobile motor car, (car wiper, car fan control cooling fan control, automobile air-conditioning fan speed control motor speed)<br> 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.<br> 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 below freezing environment.<br> Working voltage: DC9V- DC 50V<br> Max instantaneous current: 40A<br> Output power : 0.01-2000W (max)<br> Recommended use range:12V 250W;24V350W;36V 400W;48V 500W<br> Quiescent current:0.025A<br> PWM Regulation range:5-100%<br> PWM Frequency : 200hz<br> operating temperature: -40C~+85C (40 F-185 F)<br> Colour:Black<br> Material:Plastic+PCB+electronic components<br> Package Contents:<br> 1 x DC Motor Speed Control PWM HHO RC Controller<br> Only the above package content, other products are not included.<br> 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.