12V Waterproof Dual Port USB Power Output Plug with DC LED Voltmeter for Car Boat Marine 2 Port USB Charger Use.

[USB] The dual-port USB socket is a reliable and robust 12V power outlet, suitable for a range of digital devices. It comes with a dust cover and a sturdy construction. [Wide Compatibility] With wires for easy installation on various materials, it's good for indoor or outdoor use. It can charge GPX devices, mobile phones, etc. [Complete Package] This set includes a USB port socket, a DC voltmeter, and all necessary mounting hardware. A versatile and convenient addition to your car, boat, or marine setup.
[Waterproof Design] The flush-mount plug features a waterproof USB cap, making it ideal for marine use or any environment where water exposure is a concern.
[Easy Battery Monitoring] The included DC voltmeter provides a convenient way to check your battery and charging system status. It has a red LED display and is easy to install.

SPEC:

Descriptions:
2 x 2-Port USB Sockets:
This is a very reliable, high-quality 12V USB range of sockets/power outlets.
Comes with a robust construction.
The unit has wires throughout so you can fit it into thin aluminum or thicker wood/fiberglass materials.
Suitable for indoor or outdoor use.
The flush-mount socket has a dustproof cover and is suitable for general practitioners, mobile phones, and other digital devices.
Specification:
2 x 2-Port USB Sockets
Waterproof Design
Power Input: DC 12V-24V
USB Socket I Output: DC 5V 1A
USB Socket II Output: DC 5V 2.1A
Output: 5V 3.1A DC (total)
Standard nut installation
Waterproof USB port
DC Voltmeter:
This is a voltmeter to check the condition of your battery and its state of charge.
The state of your battery between fully charged and discharged.
Can indicate a poor or faulty charging system. Indicates whether your battery is holding a charge or not.
The meter has easy-to-read red LED segments