Nilight 4 in 1 ON OFF Charger Socket Panel Dual USB Socket Power Outlet LED Voltmeter Cigarette Lighter Socket LED Lighted ON Off Rocker Toggle Switch for Truck Car Marine Boats RV 4 in 1 DIY Toggle Switch Panel Dual USB Socket Voltmeter 12V Outlet ONOFF Toggle Switch. Its convenient for installing and operating. Also detachable to replace other charger sockets or anything else that fits. Real Time LED Voltmeter The LED voltmeter shows accurate voltage status, reminds you whether the voltage is at a normal level, more secure for driving. Also allows quick and easy usage in the darkness. Your charging needs. SAFETY The wires was builtin 10A Fuse for overload protection. It can charge safely, without risk of overheating or damaging devices. Multifunctional product with LED indicator light, perfect for travel use. Fits for 1224V Cars, Trucks, Marine Boats, ATV, RV, etc. The USB socket with dual output 5V2. 1A, 5V2. 1A charging port Package includes 4 in 1 Toggle Switch Panel, 3 packs of connecting wires, 9 insulated terminals, 4 Mounting Screws, 1 Wiring Diagram.