The Option GT Ultra provides the latest generation of mobile broadband technologies in a Type II PC Card design. Access the internet email and business applications from your laptop while on-the-go. The GT Ultra 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 the U.S. or halfway around the world. Option GT Ultra (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 tri-band HSDPA 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* Rugged retractable antenna for superior durability OS support for Windows 2000 XP Vista® Compatible with Mac® OS X (version 10.4 or later) Included Accessories:Antenna