Product Name: 5V 2.1A 2.1A (4.2A) Marine Dual USB Charger Adapter Car Charger Socket Fast Charging with LED Diigital Voltmeter Model NO.: YJ-DS-2020 Input Voltage: DC12V Color: Blue Interface: USB Usb Number: 2 Trademark: Maiyu Transport Package: Backaging Origin: China HS Code: 8301209000 Product Description 5V 2.1A 2.1A(4.2A) Marine Dual USB Charger Adapter Car Charger Socket Fast Charging with LED Diigital VoltmeterPlease note: The voltage reading will be visible only by connecting to the battery and the voltage also can be read when the cover is engaged , it's certified by CE & ROHS with Overload, Over-current and Short Circuit Protection to ensure charging safety, meanwhile, built-in converse connection protection that ensures the circuit won't be burnt out if wrong wiring,High and Low Temperature Resistant Nylon Flame Retardant Materials, Totally Environment Friendly, working temperature from -40 Celsius Degree to 85 Celsius Degree.NOT WATERPROOFManual:This is the only USB Car Charger that didn't come with Installation Notes,but We show the wiring diagram in the product picture.And is very easy to Install.Product positive and negative wiring has been marked the power supply positive and power supply negative , please follow the signs wiring, In order to avoid damaging,You can also get electricity from fuse box for vehicle.Dual USB interface design with single output of 2.1A (max total output of 4.2A), it quickly charges for most smartphones, tablets, GPS, digital camera, PSP/MP3/MP4 and other USB-devicesLED illuminated USB charging socket with Rubber Seals, Fits any 12V-24V RV Yacht SUV Motorcycle Ship Boat Marine Van ect.With our strict quality control system, we test each item and 100% ensure in good condition before we ship.Product DescriptionThe voltage reading will be visible only by connecting to the battery and the voltage also can be read when the cover is engaged , it's certified by CE & ROHS with Overload, Over-current and Short Circuit Protection to ensure charging safety, meanwhile, built-in converse connection protection that ensures the circuit won't be burnt out if wrong wiring,so that you have maximum safety in install or use.Dual USB interface design with single output of 2.1A (max total output of 4.2A), it quickly charges for most smartphones, tablets, GPS, digital camera, PSP/MP3/MP4 and other USB-devicesLED illuminated USB charging socket with Rubber Seals, Fits any 12V-24V RV Yacht SUV Motorcycle Ship Boat Marine Van ect.With our strict quality control system, we test each item and 100% ensure in good condition before we ship.Dual USB interface design with single output of 2.1A (max total output of 4.2A), it quickly charges for most smartphones, tablets, GPS, digital camera, PSP/MP3/MP4 and other USB-devicesLED illuminated USB charging socket with Rubber Seals, Fits any 12V-24V RV Yacht SUV Motorcycle Ship Boat Marine Van ect.With our strict quality control system, we test each item and 100% ensure in good condition before we ship.