Good Material This motor controller adopts good quality materials, which is lightweight, rainproof, sturdy and to use for a long time Waterproof Design The motor controller has excellent waterproof ability, won't easy to get wet when meet water, thus ensure low malfunction for long-term use Brushless Type The motor speed controller is brushless type, working silently and sensitive to the state of electric Specification: Material: Aluminium alloy Rated Voltage: 24V Match Motor: 250W motor Speed Regulator: 1-4V Low-Voltage : 20V Suitable for: electric and scooter Size: Approx. 75 * 50 * 35 mm / 2.95 * 1.96 * 1.37 inch Weight: Approx. 122 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 white&blue motor cord, the blue for positive electrode, the white for negative electrode. Make sure that power cord is placed rightly to prevent damage.