[Blue USB Voltage Meter]: This 4.2A usb charger/12V digital voltage display with usb is equipped with blue digital LED voltage display meter, which can promptly display and monitor the voltage of the electrical system of the equipment in use, reflecting the health of the equipment. The blue light has a sense of ambience and can be installed with the corresponding color scheme of the device. [Motorcycle USB Charge]:12 volt usb charge port with digital display, Able to charge 2 devices simultaneously.Meet your charge demand in the case of lack of time.This rv boat voltage gauge does not support fast charging devices.lower current power,can reduce heat and battery pressure,which is conducive to prolonging the service life of the device. [Waterproof usb port]:This 12 volt usb charging port for boat/ 12v/24v motorcycle usb charger waterproof, features a waterproof and dustproof cover,waterproof ring,made from high-quality plastic for long-lasting durability.Ideal for outdoor and harsh environments.only prevents water damage from not getting into the Dual 2.1A usb outlet 12v/usb charge port with digital display easily, but cannot be submerged in water. [12 volt usb charging portt Mounting Size]:This usb charge port for boat/12v/24v usb motorcycle charger socket/new energy charge has a mounting hole size of 1.18 inches (30mm),making it easy to install in most vehicles, including New Energy Trams,RVs,motorcycles,and boats and switch panel. [Protection Function]:This boat usb port for car has reverse voltage protection,high temperature resistance and overload protection,which can protect your device from damage and provide a safe and stable charging experience. Perfect for replacing the old 12 volt charge.

4.2A Dual USB Charging Socket Marine, Digital voltmeter Display with USB/12v/24v motorcycle charger ,This wide voltage temperature charging has a real-time voltage display meter, the blue light has a sense of atmosphere at night, suitable for use with blue series devices.Waterproof dustproof cover and waterproof ring design, can make this motorcycle usb charger has some waterproof function, can only block external water damage, but can not submerge the charger into the water, suitable for outdoor harsh environmentsWide compatibility, suitable for multiple devices, cell phones and all kinds of digital devices, as well as new energy vehicles, RVs, yachts and so on.Can be matched with the switch to use the rocker switch, the installation size of the general market size of the openings