Key Benefits • Adds five USB 2.0 ports to any compatible computer without the tradeoffs of a hub • Supports hot-swappable device connection—plug in and disconnect peripherals without shutting off your computer • Supports bus-powered devices without a separate power supply • Easy installation—plug and play—no drivers to install Add More USB Connections Without Compromise Everybody's got USB peripherals—keyboards, mice, printers, scanners, joysticks, digital cameras, iPod® mobile digital devices, external drives—and there never seems to be enough ports on a computer to plug all of them in at the same time. Problem solved—install a Sonnet Allegro™ Express USB in your computer to add five more USB 2.0 ports! Considering a hub? Consider the tradeoffs. Every peripheral you plug in has to share a single port's bandwidth (potentially affecting the devices' performance), and you may have to plug it into a power outlet as well as your computer in order to operate some devices. Mac & PC Compatibility For complete Mac and PC compatibility list, visit product's webpage.