Car Charger & Phone Holder, aLLreLi 3.4A / 17W Dual USB Car Charger with Battery Voltage Display + Universal Magnetic Car Phone Mount Holder for Apple iPhone, Samsung Galaxy and More With this money-saving set, you'll receive a car charger for repowering the battery plus a magnetic mount holder to keep your phone screen visible while you drive Our USB car charger features an Intelligent Voltage Alarm that constantly monitors your car's battery voltage and current. If the voltage of your battery ever drops too low or grows too high, an alert light will warn you to keep charging. And the 1A just can charge 1A devices, but the 2A is intelligent port which automatically adjusts its output to ensure that the device recharges at maximum safe speed With our magnetic mount holder, you can adjust the position of your phone by tilting and rotating across 360 degrees, so you're guaranteed to be able to see your phone Our car charger has two USB ports to re-power two devices simultaneously; Universally compatible with all USB devices Magnetic mount holder can attach to any flat surface without leaving a mark or sticky residue behind, and the USB car charger will fit any cigarette lighter. You can take the set with you to use in rental cars!