4 in 1 Charger Socket Panel - This 12V socket panel is designed with 12V RV USB socket + LED digital display voltmeter + 12V cigarette lighter socket + LED rocker switch for easy installation and use. Also removable to replace other charger sockets or whatever fits. Waterproof Dual USB Charging Socket - This 12V USB car socket has built-in dual USB charging ports, two output ports: 5V/2.1A and 2.1A (total 4.2A), will automatically detect your device and charge 2 devices at the same time. Charge. Top speed! Real-time LED voltmeter, large screen digital voltmeter displays 5-48V voltage, if the voltage is in normal status, you can monitor the battery status of your car or boat. LED rocker switch - rocker design, easy to use. Long service life up to 10000 cycles. An additional cigarette lighter socket is convenient for other devices in your car. Overload Protection - Overheating, overcurrent and overload protection; this dual USB charger socket can also intelligently identify the most