Electop Dual USB Socket Charger 2.1A & 2.1A with LED Voltmeter + 12V Power Outlet + ON-Off Toggle Switch Four Functions Panel for Car Boat Marine RV Truck Vehicles GPS Mobiles(Blue) Dual USB Socket 2.1A & 2.1A with a built-in LED Voltmeter + 12V Power Outlet + ON-OFF Toggle Switch. Panel is pre-wired, Includes 4x Stainless Steel Screw. Product Dimensions: 5.28in x 1.93in x 1.58in (134cm x 49cm x 40cm).Digital Voltage Display helps to monitor vehicles electrical safety. Wide Compatibility: Fits for 12-24V car, Boat, Marine, ATV, RV etc. The USB socket with dual output 5V/2.1A charging port, Suitable for charging mobile phones, GPS, digital cameras, pads and other USB accessories. The 12V power outlet works with any standard cigarette lighter plug or lockable marine plug Overcharge Protection: It's certified by CE & ROHS, charges safely, without risk of overheating or damaging devices.Digital Voltage Display helps to monitor vehicles electrical safety. Waterproof And High Quality: with IP65 waterproof grade, made of high and low temperature resistant nylon flame retardant materials.