Sierra Wireless AC875U UMTS USB Modem (AT&T, Modem Only, No Service) Wireless USB modem with support for worldwide roaming through USDPA and UMTS networks Plugs into laptop's USB port or docking station; high-performance internal antenna Tri-band HSDPA functionality (850, 1900, and 2,100 MHz); sets up with easy-to-install Watcher software High-speed data rates of up to 3.6 Mbps downlink and 384 Kbps uplink; adjustable USB connector The AC875U plugs directly into the notebook port via a USB connector. The connector locks in three different positions for convenient access to your notebook USB port