This is a versatile and high-speed USB charging adaptor that works with most of the popular smartphones and tablets. It will juice up your device up to four times as fast as ordinary chargers. ON top of that, it has a neat LED display selection mode that lets you switch between charging specific devices. The blue light indicates you can charge anything except Galaxy Tab. A red light means anything except the iPad. If the LED is off, it means the adaptor is in data transfer mode.