Features: 1.PREMIUM MATERIAL:It is made of high quality aluminium alloy material,making it tough,durability and wearable. 2.GOOD PERFORMANCE:The brushed motor controller has good effect of heat dissipation to avoid thermal overloading,providing steady speed and sensitive control of braking and direction changes. 3.WIRE AND INTERFACE DESIGN:It adopts durability wires and smooth interface, ensuring low malfunction of long time use. 4.CONVENIENT TO USE:It is equipped with instruction labels,making it convenient to install,avoid malfunction. 5.SATISFICATION GUARANTEE:If you are not satisfied with our product received, you can apply for unconditional return and refund within 180 days. Specification: Material: Aluminium alloy Rated Voltage: 48V Match Motor: 500W motor Under-Voltage Protection: 42±0.5V Current-Limiting: 27±1A Suitable for: electric bicycles and scooter Size: Approx. 83 * 65 * 37 mm / 3.26 * 2.55 * 1.45 inch Weight: Approx. 189 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 for battery positive electrode, and black for battery negative electrode. to the thick yellow blue motor cord, the blue for positive electrode, the yellow for negative electrode. Make sure that power cord is placed rightly to prevent damage.