Car Charger,3.4A High Speed Rapid Dual Port Blue LED Light USB Car Charger,Displays Car&iexcl;&macr;s Voltage with Warning Buzzer,Compatible with Most of Android/windows Smart Cell Phone and Tablets. Intelligent Dection - If the Voltage of your car is lower than 11.8V,the interface of the car charger will display LOW with red LED,reminding the low Voltage FAST DOUBLE USB CHARGING PORTS - Combined 3.4 amps;Using smart technology to ensure each device pulls the right amperage. Charger is powered by the vehicle's cigarette lighter. Equipped with Over-charge Protection. (Auto power off when input/output is greater than safety current, protects against over-heat, over-current and over-charging.) Lightweight and portable connects your smart phone with your laptops or Notebooks by 2 USB ports. Charge multiple devices at the same time from one USB port.suit for taxi. LED digital luminescence tubes; Display device's charging current, and the voltage of the vehicle's car battery. The LEDs are bright enough to read the display without being a distraction while driving. USB Port is COMPATIBLE With All Apple, iPhone, iPad, iPod, Android, Samsung Galaxy, Smart Phone, Tablets and All Other USB System Devices. Cell Phones, Tablet, MP3 Music Players, Digital Cameras, Headphones, GPS Systems, Power Packs and so on.