Are you still worried about the sensitive control of your electric motor controller? Do you still looking for one type of easy installment motor controller board? Look at this one, it can satisfy all of your needs. choose it, and you can gain another experience! Specification: Material: Aluminium alloy Rated Voltage: 24V Under-Voltage : 20±0.5 Speed Regulator: 1-4V Match Motor: 350-500W motor Suitable for: electric and scooter Size: Approx. 83 * 65 * 37 mm / 3.26 * 2.55 * 1.45 inch Weight: Approx. 186 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. WE SELLER HAS TO SAY: We thank you for looking for our store. We insist in the principle of customer first. We will provide best service for you if you have any question to consult.