[Convenient Contact Switch]This car charger is Designed with a high-quality & easy to operate on/off Contact switch for energy-saving and devices protection, controls 2 USB charging ports and LED voltmeter, never need to worry about draining battery power. Note: the red led light only shows up when connected to power and the switch is on.[100% Waterproof and Dustproof]Unlike other products on the market, this USB charger for panel mounting is designed with a fully sealed protective cap, which is 100% waterproof and dustproof. IP66 waterproof, works great on ships, boats and motorcycles.[LED Voltage Display]This car charger builts in digital blue LED voltage monitor, displays the real-time voltage status of your vehicle battery, prevents problems caused by low voltage. The LED light also makes quick and easy to find USB ports in the dark or at night.[Faster Than Fast]Designed with QC 3.0 USB port, whose max single output is 18W. Built-in smart chip will intelligently detect your devices and charging devices at optimal current, charge compatible devices up to 4 times faster than conventional charging, twice as fast as Quick Charge 1.0 and 38% more efficient than QC 2.0.With Over-charging, Over-current, over-heating and Short Circuit Protection to ensure safety, meanwhile, built-in Smart IC ensures the circuit won't be burnt out if wrong wiring. Easy Installation- this usb socket outlet fits most vehicles dash panel and rocker switch panel, very easy to be installed within 25 minutes, just connect "+" to battery positive pole, "-" to negative pole.Colour: blackMaterial: ABSPackage Contents:1 x charger1 x Connecting wire with fuse (wire length 60CM)Kindly Reminder:1. Power connecting wires, usb cable and devices should support QC 3.0 fast charge.2. For vehicles, it's recommanded to get power from fuse box, while for the motorcycle, better connect to the wires of the key switch.3. The voltage meter reading led will show up after the item is connected to the battery.4. Since the series does not support fast charging, so their charging speed is normal.5. Be sure to connect "+" to battery power positive pole, "-" to negative pole.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.