This item is a DIY four hole panel base which includes 2.1A Dual USB Socket, Voltmeter, 12V Outlet and Toggle Switch. It will make your vehicle more modern and more practical. Easy to install, convenient to use. Widely used for car, truck, Rv, ATV, boat, etc. The precise design insures its practicability and working performance. Features - Shell Color: Black - Material: ABS - Size: Approx. 12 x 12 x 9cm/ 4.7 x 4.7 x 3.6 inches (LxWxH). - USB Output: DC 5V / 3.1A. - LED light color: Red - Power Outlet: DC 12V. - Voltmeter Display Range: 6-30V. - with maximum endurance to ensure long-lasting durability. - Easy to use and install with long service life. - Dual USB charging ports with protective for great protection. - Four Functions Panel for Car, Boat, Marine, RV Truck, Camper, Vehicles, GPS Mobiles, etc. - The switch can be wired first so that it will terminate any parasitic power draw by the voltage meter or the buck converter inside the USB power outlet when switched off.