ITEM NAME:DC 9V-55V 40A Motor Speed Controller Electric PWM Speed Control Regulator #gib Product Description Description: DC 9V-55V 9/12/24/36/48/55V 40A Motor Speed Controller Electric PWM Speed Control Regulator with Reversible Switch Specifications: Product Name: ZW40 Input voltage: DC9-55V Output voltage: linear under load Output current: 0-40A Continuous power: 2000W Speed regulation type: regulating Speed regulation: potentiometer (linear) Speed range: 0 - 100% Control frequency: 25KHZ Wiring type: barrier terminal Knob specification: 100K (148) Module size: 83*56*28mm/3.26*2.2*1.1'' Main board size: 72*48mm/2.83'' Potentiometer press open: 7mm/0.27'' Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Included: 1 x Motor Speed Controller.Speed regulation type: regulating. Speed range: 0 - 100%. Due to the different display and different light, the picture may not show the actual color of the item. If item is defective after 3 months, you can still send it back to us.