4.2A Dual USB Charger with Blue Digital Voltmeter - Universal Waterproof Dual 2.1A LED Power Outlet as Replacement of 12V/24V Volt Socket to Rocker Switch Panel on Boat Car Truck Vehicle Motorcycle

4.3 out of 5 stars 91 ratings

Available from these sellers.
4.2 Blue Circle
  • Genuine Marine USB Charge Socket with a built-in LED Digital voltmeter, voltage monitor. Monitors the vehicle's battery and electrical system automatically in real-time and indicates the voltage in the screen.
  • All-round USB Charge outlet plug wIth dual 5V/2.1A 2.0 fast charging port, built-in smart charging IC, will auto detects and charges two devices simultaneously at full speed, better charging performance.
  • Multiple protection against over-current, overcharging, overheating and high temperature will guard the safety of your devices. Anti-surface cover allows it do good job on boat! Adopted PA66 environment-friendly nylon material, high temperature resistant, low temperature resistant, also has anti-flame-retardant properties, makes it a high safety standard product.
  • It is wide compatibility fits for almost input DC 12V-24V RV car, Boat, Marine, ATV etc. The advanced full nylon body with a scratch resistance technology, keeps it sturdy and protects it against drops and scratches. High quality nylon material let your car charger always looking like new.
  • Many people like to use a car charger, but please note that the car charge output current can not be less than the maximum rated input power of the phone or device, and please prohibit charging while using power consumption applications.

Get 90 days FREE of Amazon Music Unlimited
with the purchase of any eligible product. Shop now

Special offers and product promotions

  • Get 90 DAYS FREE of Amazon Music Unlimited with purchase of an eligible product. Listen FREE for 90 days. Learn more here.

Product Information

Colour:4.2 Blue Circle

Technical Details

Additional Information

Have a question?

Find answers in product info, Q&As, reviews

There was a problem completing your request. Please try your search again later.
All Product Information Customer Q&A's Customer Reviews

Your question might be answered by sellers, manufacturers, or customers who bought this product.

Please make sure that you've entered a valid question. You can edit your question or post anyway.

Please enter a question.

Product description

Colour:4.2 Blue Circle

Genuine Marine RV Car USB Power Socket Charger is convenient for your on travel or outdoor.

It can be installed vertically, horizontally or underneath the dash, or any flat surface.

It also can replace the old function of the switch panel, DIY you need.

Compatible with mobile devices USB 2.0, any device including digital cameras, PDAs, mobile phones and USB accessories

The advantages of Genuine Marine Dual USB Charger with Blue Voltage Dispaly

√ Over-charging Protection.

√ Anti-Rust USB interface.

√ USB outlet 5V up to 4.2A (2.1A+2.1A)

√ With built-in LED voltage indicator display, you can Monitor voltage anytime, anywhere,

√ the maximum safety in use.

√ Water-resisting protective caps and USB cover, keep away from liquid, moisture, corrosion and dust.

√ Works with all USB-powered devices like iphoneX Iphone iPhone 8/ 8 Plus/ X/ 7/ 6S, Samsung Galaxy S9/ S9+/ S8/ S8+/ S7, iPad, android tablets, power bank, video games controllers, sports watch, cameras, etc.



The charger is not QC3.0 which doesn’t support qualcomm quick charge.

Pls check the maximum voltage on devices to charged in advance.

Our Waterproof Dual USB Outlet is for 12/24V vehicles only.

Always cover outlets when not in use to avoid dust and water entering.



Power input: DC 12V-24V

Power output: 5V 2.1A/2.1A (4.2A)

Blue LED indicator

Package Included:

1 x Dual USB Car Charger Adapter

2 x Insulated Terminals


How long is the warranty period?

✔12 months warranty, not man-made damage.

✔30 days to return the goods, if the product has any problems.

✔24 hours to provide customer service, welcome to consult.

Customer Questions & Answers

Customer reviews

4.3 out of 5 stars
4.3 out of 5
91 global ratings
How are ratings calculated?

Review this product

Share your thoughts with other customers

Top review from Australia

Reviewed in Australia on 6 October 2020
Colour: 4.2 Blue CircleVerified Purchase

Top reviews from other countries

5.0 out of 5 stars Very nice gauge
Reviewed in the United States on 22 December 2018
Colour: 12V Voltmeter-ST0023AVerified Purchase
3 people found this helpful
Report abuse
D. Costner
5.0 out of 5 stars Helps me gauge my Inverter battery
Reviewed in the United States on 19 July 2020
Colour: 12V Voltmeter-ST0023AVerified Purchase
One person found this helpful
Report abuse
4.0 out of 5 stars Works as advertised, but the fitment is loose.
Reviewed in the United States on 20 September 2020
Colour: 4.8 Red SquareVerified Purchase
review image
Josh Fitz-Gerald
5.0 out of 5 stars great addon to my car
Reviewed in the United States on 16 February 2019
Colour: 4.2 Red SquareVerified Purchase
2.0 out of 5 stars Not Waterproof.
Reviewed in the United States on 14 May 2020
Colour: 4.2 Red SquareVerified Purchase