Apple AirPort Extreme Base Station. Simultaneous dual-band g wi-fi uses the 2.4 GHz bands simultaneously, providing maximum range and device compatibility. Separate guest network for wi-fi sharing with friends. Compatible with a/b/g/ Mac, iPad, iPhone, iPod touch, Apple TV, PCs and other wi-fi devices. USB port for sharing a printer (Mac and PC) or external hard drive over wi-fi. Built-in firewall, WPA, WPA2 and 128-bit WEP security. The Apple AirPort Extreme g can be used as a full-featured wi-fi router in-conjunction with an ADSL modem or cable modem. Alternatively, it can be used in Bridge mode (onboard router disabled) on a network that already has a wired router, providing wi-fi access, USB printer sharing (Mac and PC) or hard drive sharing. There's a Ethernet switch built in as well.