Product Features: 

• Waterproof Dual USB Charger Socket: Built-in dual USB Fast Charging Technology. Two ports output 5V/2.1A&2.1A (total 4.2A), that's enough to charge two devices simultaneously!
• Multifunctional LED Display: It’s a voltmeter, display the voltage of vehicle's battery. Let you always monitoring the health of battery and peace of mind when drive; It's a subtle blue light, allows you easy find the device in dark; Moreover, it also can check whether the connection is successful.
• Considerate Design: This USB Socket charger add a USB Cap specifically. You can not only read the voltage but also keep the dust out when the cover down. Really a good companion for your Car, RV, Boat, Marine or Motorcycle.
• Overcharge Protection: Meets CE/ROHS certification, charges safely, without risk of overheating or damaging devices.
• Waterproof & High Safety Standard Material: With IP66 waterproof grade, allows it do good job on boat! Adopted metal material, high temperature resistant, low temperature resistant, also has anti-flame-retardant properties, makes it a high safety standard product.