Specification :

The AirCard® 875U USB Wireless modem is a new addition to the Sierra Wireless product family. Packaged in a stylish, compact form factor, the AirCard 875U USB modem can either plug directly into any USB port, or can be connected via the docking cradle (please check with carrier for availability). Compatible with both Microsoft Windows and Mac OS X operating systems, the AirCard 875 USB modem offers customers an alternative to both PCMCIA and ExpressCard solutions.

Transfer wireless data at speeds up to 3.6 Mbps on HSDPA capable networks
High performance internal antenna
Supports worldwide roaming through HSDPA and UMTS on the 2100, 1900 and 850 Mhz band, Quad-band Class 12 EDGE / GPRS on the 850, 900, 1800 and 1900 MHz bands
Supported OS: Windows® Vista, XP, 2000, and Mac OS X
Field firmware upgradeable