This 4 Port USB 2.0 Hub connects to one USB 2.0 port on a Mac or PC computer, adding four USB 2.0 ports - allowing you to maximize the number of high speed USB peripherals connected to your computer. The hub supports cascaded installation with other USB 2.0 hubs, supporting up to 127 USB 2.0 device connections - a scalable solution for connecting multiple USB devices to a single host computer.The 4 port hub includes a power adapter, but can be powered through USB bus connection to the host computer - allowing you to install the hub as needed without worrying about the availability of a power outlet.The USB 2.0 hub offers an attractive black casing that suits any operating environment and includes a 3 feet USB 2.0 A/B male-male cable, for the connection between the hub and the host computer.   Features : Quick, easy installation Compact space saving design Choice of Bus Power and/or External Power Adapter Maximum data transfer rate of up to 480 Mbps and backwards compatible with USB 1.1 Hot Plug and Play feature allows devices to be connected or disconnected without turning off the PC Comes complete with a wall-mount power adapter and a 3 ft. USB 2.0 A/B male-to-male cable Connect up to four USB devices Hot swap capabilities allow you to connect and disconnect devices without rebooting PC and Mac compatible Lightweight, convenient to carry Case Colour : Black Certifications : CE, FCC Depth : 9.7 cm Form Factor : USB Hub Height : 1.9 cm Operating Systems Supported : Microsoft Windows 98SE, ME, 2000, XP, 2003 and up, Mac OS 8.6 or up (OS 10.2.4 needed for USB 2.0 speeds) Product Type : USB Hub Weight : 0.3 kg Width : 6.8 cm Interface : 4 x USB 2.0