The ultra small 4-port USB 2.0 hub is the most versatile and powerful hub on the market. This USB 2.0 certified hub allows you to connect up to four USB devices to a single USB port on a PC/mac/laptop. This hub has been certified by the USB-IF to support hi-speed data transmission rates up to 480Mbps. Perfect for both the desktop and mobile user. For the mobile user, this full featured hub with self stored cable is the size of a 3/8" thick credit card making it the ideal "pocket size" solution the user on the go. For the desktop user, an extension cable has been provided so that the hub can be located within easy reach, wherever the PC is located. While the hub will function perfectly in virtually all cases without needing external power, a compact, international AC adapter (110/220V ) has been provided for the rare circumstance when connecting a power hungry device. This USB 2.0 device is backwards compatible so that it will function with both USB 2.0 devices as well as USB 1.1 peripherals. Comes in a clamshell retail package. Tripp Lite offers a lifetime replacement warranty on all cable products.