DESC: Sierra Wireless 598u Broadband Wireless Internet USB Card Sprint Spring 3G Wireless Broadband Internet USB Adapter Software Preinstalled - Just plug and play Quick and Easy to use Great high speed internet on the go Stay connected to your business as well as online friends and family via the high-speed Sprint Mobile Broadband Network with the Sierra Wireless 598U USB modem. A MicroSD expansion slot provides convenient back up storage or file transfer on memory cards of up to 32 GB, so you can carry high resolution images, large music files, presentations and other necessary documents with you wherever you go and share them as needed. And with the latest version of Sprint Mobile Broadband software, you can take advantage of the optional Sprint Navigation service. The 598U modem is optimized for Sprint's Evolution-Data Optimized (EV-DO) Revolution A (Rev. A) network, which provides average download speeds of 600 kilobits per second (kbps) to 1.4 megabits and average upload speeds of 350 to 500 kbps.