and high qualityIt 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 speed control and running machine control of motor speed, multiple computers parallel speed control, electronic fan speed control.All kinds of dc lamp dimming, all kinds of dc heater adjust the temperature, This speed governor is the grade quality for the industrial , can work in freezing environment.Colour: Blackmaterial: Plastic + metalWorking voltage: DC10V- DC 50V current: 40AOutput power: 0.01-2000W (max)Recommended use range:12V 250W;24V350W;36V 400W;48V 500WQuiescent current:0.025APWM Regulation range:5-100%PWM Frequency: 200hzPCB Size:90x51mm(inch:3.5 inchx2 inch)Case size:105x55x40mm(inch:4 inchx2.2 inchx1.6 inch)operating temperature: -40Celsius~+85Celsius (40 F-185 F)Shipping Weight: 150gMain Usage: widely use to people DIY, hobby, scientic test, such as control computer fan speed, control bulb, control motor kymco, control xbox360, HHO Pluse Width , 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 Contents:1* 40A DC Motor Speed ControlOnly 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.