The Tripp Lite 4-Port USB 2.0 Hi-Speed Ultra-Mini Hub is an inexpensive way to expand the number of available computer USB ports. Its compact design with built-in cable is perfect for travel, fitting easily into a laptop bag pocket. It supports USB 2.0 data transfer rates up to 480 Mbps and is backward compatible with USB 1.1. No external power is required. 3-year limited warranty