The Option GT Ultra Express provides enhanced mobile broadband performance for quick easy access to email the internet and business apps on your laptop while on-the-go. The GT Ultra Express operates seamlessly across AT&T's 3G BroadbandConnect and EDGE networks providing you the perfect combination of performance and coverage. And with quad-band GSM support you can stay connected whether traveling across town or halfway around the world. Designed to work with newer laptops with slots it has a convenient flip antenna that will keep you connected wherever business takes you. Option GT Ultra Express (AT&T) also includes:Work seamlessly between AT&T's 3G and EDGE networks Access email internet and business applications while on-the-go Global compatibility with the world standard for wireless - GSM Quad-band GSM/GPRS/EDGE tri-band UMTS/HSDPA/HSUPA Expected HSDPA download speeds of 600 Kbps - 1.4 Mbps* Expected HSDPA upload speeds of 500-800 Kbps* Expected EDGE download speeds of 70-135 Kbps* Flip-up antenna for optimal mobile broadband performance OS support for Microsoft® Windows 2000 XP Vista® Compatible with Apple® Mac® OS X (version 10.4 or later) Plug-and-play compatibility with AT&T Communication Manager software Designed to work in newer laptops with ExpressCard slots Included Accessories:Flip-up Antenna