Time Capsule is a wireless network-attached storage device designed to work in tandem with the Time Machine back-up utility, introduced in Mac OS X 10.5 Leopard. The device includes a full AirPort Extreme Base Station router (with 802.11n wireless, an Ethernet WAN port, three Ethernet LAN ports and a USB port). Storage is provided by a 2 TB hard disk drive @ 7200RPM.