Charge Multiple 12V Accessories Power multiple 12V accessories in your 4WD, Caravan, campervan, or at the campsite with the 3-way cig. Conveniently fits into any standard 12V cigarette lighter and turns 1 charging option into 3! 4 x USB Ports Featuring a QC3.0 Port Get blazing fast charging on all your Camping USB Devices with the 2 x 2.4A USB ports QC3.0 Ports charge phones, tablets & more! Individual Power Switches Easily manage your accessories power consumption with the individual power switches. Simply turn off any cigarette sockets you are not using and prevent your car battery from accidentally being drained. Master Power Switch Easily Turn off all USB ports & Cigarette ports with the master power switch. No need to manually unplug all your devices just, at a touch of button power off connected devices Built-in Voltmeter Don’t let a flat battery ruin your weekend! The LED voltmeter is capable of monitoring the voltage of your vehicle’s battery or electrical system. Detachable Mounting Cradle Keep your 3-way Cigarette Lighter close by with this detachable mounting cradle. Attach it to the wall via the sticky pads on the back, then detach and carry away Cigarette lighter for easier use at home or around the campsite. How to charge your USB mobile device Note: Please turn off the switch after you leave the car for power-saving. Start the car Make sure the DC plug is fully inserted into your car’s DC socket(cigarette lighter) Plug one end of your original USB cable into the any USB power,and the other end into your mobile device. Turn on the switch Charging should begin automatically. If more USB ports needed, put any car charger adapter with USB port(s) into the any of the 3 sockets,and then repeats the process.