Features: Compatible with most of USB devices, such as iPhone, iPad, iPod, Samsung, BlackBerry and other smart phones, MP3, etc. 4 USB ports: one exclusively for iPad iPhone, one for Galaxy; and two standard USB ports. Supports charge 4 devices at one time through just one wall socket. With a compact design, offers fast and efficient charging. Short circuit protection, so it's safe enough to use. LED indicator: blue light(empty load or complete charging), blue+red light(while charging). Note: Charge your devices via proper USB cables (USB cables are not included in the package).