Tested & Working. Comes with original AC adapter.

The new AirPort Extreme features a Gigabit Ethernet (10/100/1000BASE-T), maximum speed has been increased up to 540 Mbps, compatibility with 802.11a/b/g/n protocols, guest networking, three LAN ports, the possibility to connect up to 50 devices, and Dual-band operation on 2.4 GHz and 5 GHz simultaneously.