Features 1、Speed controller is made with high quality circuit board which ensures a longer service life 2、This simple and easy‑to‑use DC motor speed controller has an elegant appearance and stable performance 3、Well design case can protect the controller board from damage as well as dissipate heat 4、There are two build‑in 80A large current relay in this motor speed controller which ensures a better regulation 5、This motor speed controller would allow setting direction of rotation that accomplishes reversing the motor's direction Specification 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 load Maximum Current: 40A Rated Current: 30A Frequency: 16KHz Speed Range: 0% to 100% Forward & Reverse: Support Regulation Method: Potentiometer with switch Regulation Type: Regulating Current Size: 110 x 90 x 78 x 38mm / 4.33 x 3.54 x 3.07 x 1.50" Fitment: Suitable for DC brushed motors within 12V 250W, 24V 350W, 48V 500W Package Includes: 1 x Speed Controller Note: 1. This product is only used for speed regulation of DC brushed motors; 3. This product cannot be powered by 48V batteries or accumulators; Please confirm your needs before ordering. Package List