Multiple Safety Protections - AUOPLUS Cigarette Lighter Adapter is officially certified by FCC & UL. (What you get: 1*Cigarette Lighter USB Charger, 1*User Manual, 2*Velcro). Power-Safe Switch - On/Off Switch to control all sockets and ports to avoid inserting and pulling out the plug frequently, save energy and reduce the wear and tear, and expand the lifespan of your appliances in your car. LED Display - Monitoring your car battery voltage and warning when below 12V with flashing numbers on digital LED display. Monitor battery voltage in real-time to protect the battery, prolong the service life of the battery. 4 USB Fast Charging Ports - Built-in Smart IC technology, which can detect your devices intelligently to deliver the fastest possible charging speed(Max 5V,2.4A). This car charger can charge 4 USB devices simultaneously, fit for phone, MP3, iPad, tablet, Kindle, USB fan, USB light, etc. 3 Cigarette Lighter Sockets - 7 in 1 for most 12V/24V vehicles. Up to 6.8A and 120W power can charge the phones, pads, MP3, GPS, Cam, DVD, car refrigerator, humidifier, vehicle-mounted vacuum cleaner, etc at the same time, easy to use.