Features: 1. The controller shell is made of aluminium alloy, which can protect the inner circuit and good Compatible with heat dissipation to avoid thermal overloading. 2. This item is a brushed motor controller, it can provide steady speed and sensitive control of braking and direction changes. 3. The wires and interfaces are durable, and ensure low malfunction of long time use. 4. The interfaces have instruction labels on them Compatible with your easy installation. 5. Suitable Compatible with electric ycles and scooter. Specification: Material: Aluminium alloy Rated Voltage: DC 36V Match Motor: 500W motor UnderVoltage Protection: 31.5?¡§¡è0.5V Suitable Compatible with: electric ycles and scooter Size: Approx. 83 * 65 * 37 mm / 3.26 * 2.55 * 1.45 inch Weight: Approx. 184 g Package List: 1 * Brushed Controller Noted: 1. Please read the labels on the interfaces of the controller, make sure that every interface is rightly connected to what it matches. 2. To the thick black&red power cord, the red is Compatible with battery positive electrode, and black Compatible with battery negative electrode. to the thick yellow&blue motor cord, the blue Compatible with positive electrode, the yellow Compatible with negative electrode. Make sure that power cord is placed rightly to prevent damage.