Charge 4 devices at once while on the go by turning one 12-volt power port into three 12-volt ports and one USB port with this sleek adapter that fits in most cup holders. Conveniently fits in your vehicle cupholder for easy access and use. Features a 2.1 AMP USB port and 12-Volt power plug with 10 AMP fuse. Connection ports glow in the dark making them easy to find in low light conditions. The 10 amp fuse built into the 12-volt power plug prevents overload to protect your vehicle and devices. This cupholder 12v power source has a 16-inch cord for convenience which stores neatly inside the bottom of the power outlet. The smart and convenient cupholder is designed to fit snugly into your truck or car cup holder making it ideal for use in the car while you head to your family vacation or one your way to the office. This10 amp 12 volt power supply is a great truck accessory and makes a great gift for anyone who travels a lot for their job or for recreation. RoadPro has everything you need to be your most comfortable and your most productive out on the road - no matter what you do.