Dual USB Charger: 30W PD USB-C port and 18W QC3.0 USB-A port, allowing you to charge two devices simultaneously at optimal speed LED Voltmeter: The car USB socket charger adapter includes a blue voltmeter that automatically monitors the vehicle's battery and electrical system Button Switch: This 12V marine power outlet features a switch that can save power and prevent the battery from being drained when not in use Simple Installation: Mark the hole and drill, insert the outlet, and screw in the screws. Connect the red wire to '+' and the black wire to '-' Wide Compatibility: The usb charging panel fits 12-24V vehicles, motorcycles, ATVs, boats, and more. The 12V USB outlet panel is compatible with various Samsung, iPhone, cameras, etc