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. Throughput up to twice as fast as previously available. 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.