"Multifunction Panel: This 6 port panel has two USB ports + LED voltmeter + 12V 3 pin socket + switch toggle switch. They are interchangeable and you can replace each port with an extra USB port or all Other applicable ports. Wide compatibility: suitable for 12V/24V equipment such as cars, ships, ships, trucks, RVs, ATVs, RVs, vehicles, etc. Widely used in mobile phones, tablet computers, GPS, digital cameras, PDAs, etc. USB socket Safety: Passed CE, ROHS certification, with overcharge, overload, short circuit protection to ensure safe charging. Built-in reverse terminal protection to ensure that the circuit will not burn out when wiring is wrong. Voltage monitoring safety line: When driving, the LED voltmeter shows 0 -24V voltage, when the voltage is normal, it can be reminded to ensure driving safety. Flexible charging: 3 cigarette lighter sockets are enough to use various handheld devices in 12V/24V vehicles at the same time, such as GPS, driving recorder, DVD player , FM transmitters and other small devices.""