Dell Sonic WALL NSA 250M Wireless-N high-performance, modular next-generation firewall offers branch offices & distributed enterprises in-depth frontline security, application & user control, network productivity & optional 802.11 dual-band wireless. The NSA 250M acts as the first line of network defense against viruses, Trojans, key-loggers & other application layer attacks, without compromising network performance. The NSA 250M series can be extended with a variety of modules to provide deployment flexibility & reduce acquisition & maintenance costs. The NSA 250M series offers an extensive array of advanced networking & configuration flexibility features in an accessible, affordable platform that is easy to deploy & manage in a wide variety of environments.