in 1 DIY Toggle Switch Panel: Dual USB Socket + Voltmeter + 12V Outlet + ON/OFF Toggle Switch. It??s 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 SAFETY: The wires were built-in 10A Fuse for over-load protection. It can charge safely, without risk of overheating or damaging devices Multifunctional product with LED indicator light, perfect for travel use. Fits for 12-24V Cars, Trucks, Marine Boats, ATV, RV, etc. The USB socket with dual output 5V/2. 1A, 5V/2. 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 Fit Type: Universal Fit Product description Product Description: Material: Made of engineer