These little units are remote controller and control box. It will work well when running on 12 . There are 24keys in the controller to help control the LED light. The connector of the control box is 4-pin design which is more convenient and safer. Feature - Color: White - Material: Plastic - Controller Size: 84.6x51.6x7.1mm/3.3x2.0x0.3inch - Control Box Size: 49.5x34.5x22mm/1.9x1.4x/0.9inch - Working temperature: -20~60°C - Input Voltage: DC 12V - Output Voltage: DC 12V - Output: Three CMOS drain-open output - The are keys in the controller. - Easy to adjust color temperature and brightness. - It comes with short-circuit protection function. - Made of quality material, it is safe and practical. - 4 pin connector is more convenient. Package list: 1 x Keys Remote Controller(Battery Included) 1 x Control Box 1 x User Manual