This 3 port hub is perfect for users who require additional USB ports and want a simple plug and play USB hub that fits in the standard size round cable pass through cutout found in most office or computer desks . Features: - Plug any play - no drivers required. - Interface: USB 1.1 USB 2.0 (480MB/s USB 2.0 high speed). - Operating systems supported: Windows 98/ME/2000/XP/Vista Mac OS 8.6 ~ 9.x / OS X - Diameter: 60mm (2.36 in.) - USB cord length: 1m (~44 in.) This is a bus-powered hub. Dual USB connector cable augments power by utilizing 2 host USB ports. Before purchasing this product please measure the cable pass through cutout in your desk to ensure that it is the proper size for this product.