and high quality It is fit all kinds of general-purpose 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 below freezing environment. Colour: Black material: Plastic + metal Working voltage: DC10V- DC 50V 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 PCB Size:90x51mm(inch:3.5 inchx2 inch) Case size:105x55x40mm(inch:4 inchx2.2 inchx1.6 inch) operating temperature: -40Celsius~+85Celsius (40º F-185º F) Shipping Weight : 150g Main Usage: widely use to people DIY, hobby, scientic test, such as control computer fan speed, control bulb, control motor , control xbox360, HHO Pluse Width modulator, Test Equipment, industrial automation, speed regulator module board support PLC, motor electric pump fan speed control, PWM HHO RC controller,remote control toys, etc...... Package include: 2 x 40A DC Motor Speed Control Only the above package content, other products are not included. Note: Light 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.