Connect up to four USB devices to a single USB port on a PC/Mac/laptop.Supports all data transfer rates up to 480Mbps.Compact design with built-in cable (6-in.), perfect for travel.Diagnostic LEDs indicate power and port status.All four ports support USB Battery Charging ( BC ) specification v1.2, providing up to 1.5A for fast charging of mobile devices.Compatible with all major operating systems.Includes External Power Supply with NEMA 1-15P Plug.Plug-and-play/hot-swappable allows you to add or remove a device at any time.