Ports quantity: 4 480 mbit s silver quickly and easily share a usb 2.0 Device between four different computersthe usb421hs 4-to-1 usb switch box allows for a usb 2.0 Device to be shared with up to 4 different computer systems, without having to disconnect and reconnect the cabling everytime. Push-button controls makes switching between computers quick and easy, with additional keyboard hot-key switching and windows based software also available. With no external power adapter required, and with its compact design, the usb 2.0 Data switch takes up very little space and is easily portable. Backed by a startech.Com 2-year warranty and free lifetime technical support.The startech.Com advantage- share a high speed usb 2.0 Device with up to 4 computers and easily switch between them through push-buttons, keyboard hot-key commands, or software- a compact desktop form factor and no external power requirement makes for an easy to use and portable data switch- backed by a startech.Com 2-year warranty and free lifetime technical support ports & interfaces ports quantity 4 usb 2.0 Ports quantity 4 features data transfer rate 480 mbit s product colour silver led indicators yes plug and play yes certification ce, fcc, rohs system requirements compatible operating systems windows 2000 xp server 2003 vista 7server 2008 r2mac os 10.4 10.5 10.6Linux weight & dimensions width 50 mm depth 101 mm height 19 mm packaging data package width 243 mm package depth 167.5 Mm package height 73 mm pack...