12V/24V USB Outlet Quick Charge 3.0 Dual Port Car Charger Socket with Blue Voltmeter, Waterproof Aluminum Cigarette Lighter USB Charger DIY Kit for Car Marine Motorcycle RV Boat Golf Cart, etc.

[Dual QC 3.0 USB Ports] Equipped with high quality dual QC 3.0 USB ports, it charges two compatible devices up to 4x faster than traditional charging and is compatible with QC 2.0 / 1.0. It also provides the fastest charging for all non-fast charging devices.
[Aluminum Material] The advanced all-aluminum body with scratch-resistant technology keeps it sturdy and keeps the 12v USB outlet looking like new forever. The upgraded metal USB cigarette lighter socket will not overheat at high temperatures, which is safer than plastic ones.
[LED Voltmeter Display] Features a blue LED voltmeter that automatically monitors the vehicle' s battery and electrical system and displays the car' s voltage on the screen. The Hapytrip dual USB charger receptacle lets you know the health of your battery while you drive.
[New Push Button Switch] The new version is designed with a push button switch that can be turned on or off at any time. Avoid repeated plugging and unplugging of the charging cable. Helps to save energy.
[Wide Compatibility] The charger is suitable for DC 12/24V cars, boats, ships, motorcycles, ATVs, RVs, etc. Also, the dual USB ports are suitable for charging iPhone, Samsung, iPad, Android tablets, power banks, video game controllers, sports watches, etc.
[All-around protection] The 12V USB car socket is UL CE and ROHS certified with overload, overcurrent and short circuit protection to ensure charging safety; this USB car charger guards the safety of your devices. The waterproof and dustproof rubber USB cover can better protect its internal circuitry and effectively increase its service life.
Easy installation: You can replace your car' s original cigarette lighter socket with this USB charger. Or, you can DIY the installation by drilling a 1.18 inch/3cm hole, inserting the charger and tightening the ring, then connecting the positive and negative wiresRed wire to Silver plug(+), Black wire to Golden plug(-). See the pictures for detailed installation instructions.
Please note: The bottom of the product is marked with " +" and " -", the red line connects to +, the black line connects to -; if the connection is reversed, it will not be energized.