[Steady Speed]: The main function of this electric brushless controller is to provide your car with a stable speed, and it can control the direction sensitively, and improve your driving flexibility [Good Heat Dissipation]: This motor brushless controller adopts a speciall design, which can effectively help the internal circuit to dissipate heat and avoid thermal overload [Aluminum Alloy]: This motorcycle speed controller is made of high-quality and aluminum alloy, so the wires and interfaces are sturdy and durable, which can effectively extend the service life [Easy Installation]: The rated working voltage of this brushless controller is 36/48V, and there are instructions on the interface, which can help you install more quickly, suitable for electric bicycles, Colour:Silver Material:aluminum alloy Package Contents: 1 * Brushless Controller 1 * English instructions Only the above package content, other products are not included. Note: Light reflection 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.