for Kukirin M4/M4Pro Scooter Controller 48VDC FAST HEAT DISSIPATION: Designed with grooved shell, which can dissipate heat well, protect wires from damage and avoid thermal overload. ALUMINIUM ALLOY: The controller is made of aluminum alloy, with light weight, corrosion resistance, wear resistance and long service life The Controller Housing: The outer shell of the controller is made of high-quality metal material with a grooves design, which is able to protect the internal circuitry from thermal overload. High Performance: It is easy to install and use, and is equipped with wiring identification diagrams to provide steady speed and sensitive braking and directional change control. Sensitive Control: The brushless motor controller can provide steady speed and sensitive control of braking and directional changes, providing a satisfying experience. Easy to Use: Our electric scooter brushless motor controller is easy to install and use, and it will not increase your burden or cause additional energy waste. Colour:As Shown Material:Metal+Plastic Package Contents: 1x Mainboard motor controller 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.