Different part numbers, nearly identical specs. MB053LL/A:
Works with iPhone, Apple TV and more
AirPort Extreme works flawlessly with iPhone and Apple TV.
It's compatible with 802.11a/b/g Wi-Fi wireless clients. And because it's dual-band, you can set it up to work on either the 2.4GHz or 5GHz band, reducing the chance of radio interference. The AirPort Extreme Base Station is Wi-Fi Certified for 802.11n draft 2.0.
Works with Apple TV and more
AirPort Extreme works flawlessly with Apple TV to transfer your media from iTunes on your computer to your TV.
It's compatible with 802.11a/b/g wireless clients. And because it's dual-band, you can set it up to work on either the 2.4GHz or 5GHz spectrum, reducing the chance of radio interference.