[Upgraded Design]Designed with an newest ON/OFF Contact button, 12V / 24V USB car charger 2 ports can control USB charging ports and LED voltmeter together flexibility, which keeps you from the hassle of repeated plugging & unplugging the charging cord and helps you protect your battery.[Dual USB Car Charger]Dual USB charging ports with single output of 2.4 A ( 4.8A) enables you chargers 2 devices at high speed simultaneously. Moreover, the built-in smart charging IC will auto detects your devices' current and power then chargers your devices at optimal speed, protects your devices overcurrent and hot.[Digital LED Display] 12 volt usb port for car equipped with a blue integrated LED volt meter which can monitor the vehicle's battery and enable you know the health of battery while driving then avoid voltage abnormal issue.[Waterproof Design]It designed with a rubber USB cap which enables it waterproof and dust-proof, better protects internal circuit and enhance lifespan effectively. accessories for all 12V-24V vehicles, marine, ATV, motorcycle, bike, truck, Golf Cart, RV, Boat, SUV, etc.[Easy Installation]Usb charger socket size fits most vehicles' dash panel. Just open a hole about 3cm diameter. And connect this socket "+" to fuse box for electricity, "-" to negative pole. Then put the socket in and screw it tightly.Compatible with all USB-powered devices like 11/ 8/ 8 Plus/ X/ 7/ 6S, Galaxy S10/ S9/ S9+/ S8/ S8+/ S7, , android tablets, power , smart watch etc.Colour: blackMaterial: copper + ABSPackage Contents:1 x charger1 x Connecting wire with fuse (wire length 60CM, the port color is random, 't accept the specified color)Friendly Notes:1. kindly that the voltage meter reading only show up until s socket connected to the power.2.For automobile, we recommended to obtain power from the fuse box. For the motorcycle, we suggest connect to the wires of the key switch.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.