The Sierra Wireless AirCard 250U is a dual-mode USB modem that provides easy access to the Internet via your CDMA and WiMAX networks. This Sierra Wireless modem automatically selects the fastest network available, so that you can access high-speed Internet, wherever you are. The 180-degree rotating USB connector allows you to easily connect this dual-mode USB modem to your computer or laptop. GPS-enabled, the Sierra Wireless AirCard 250U modem helps you find your desired location effortlessly. Additionally, this Sierra Wireless modem boasts compatibility with Windows 7 and Mac OS, and also supports video, gaming, and graphic applications. The external antenna connector on the Sierra Wireless AirCard 250U allows you to connect an antenna, so that you enjoy enhanced signal coverage.