Description:Features:Speed controller is made with high quality circuit board which ensures a longer service life.This simple and easy-to-use DC motor speed controller has an elegant appearance and stable performance. Well design case can protect the controller board from damage as well as dissipate heat. There are two build-in 80A large current relay in this motor speed controller which ensures a better regulation. This motor speed controller would allow setting direction of rotation that accomplishes reversing the motor's direction. Specifications:Output Voltage: Linear with loadMaximum Current: 40ARated Current: 30AFrequency: 16KHzSpeed Range: 0 percent to 100 percent Forward andamp Reverse: Support Regulation Method: Potentiometer with switch Regulation Type: Regulating CurrentSize: 110 x 90 x 78 x 38mm or 4.33 x 3.54 x 3.07 x 1.50" Fitment: Suitable for DC brushed motors within 12V 250W, 24V 350W, 48V 500WPackage Includes:1 x Speed Controller Note:1. This product is onlyusedfor speed regulation of DC brushed motors 3. This product cannot be powered by 48V batteriesor accumulators Please confirm your needs before ordering..