The Dual USB port 3.1 Amp USB Car Charger can charge up to two of your devices at once while you are on the go. It is engineered to stop charging devices when the battery is completely full. It offers high charging efficiency. Built-in safeguards protect your devices from excessive current, overheating and overcharging. Smart IC chip intelligently communicates with connected devices to maximize compatibility and charging speed. Blue LED indicator light lets you know the status of the charge. Use it to charge all USB powered devices – iOS, Android phones, Tablets, GPS units, Bluetooth headphones, Speakers, Smartwatches & more.