Fast charge two devices simultaneously at full speed of dedicated adaptive power output per USB port. Works with all USB-powered devices including Android and Apple smartphones and tablets. Built-in safeguards protect your devices against excessive current, overheating, and overcharging. Turn an unused cigarette lighter outlet in your car into two powerful USB charging ports. For Device Type: USB Devices; Adapter/Charger Type: Car Charger; Power Source(s): Vehicle Outlet; Connector/Port/Interface: USB.