AirPort Express 802.11n (2nd Generation): Guide to ports and connectors | Airport express, Generation, Apple support
AirPort Express - Wikipedia
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Older Airport Express is unsupported Airport Utility under Mountain Lion? No problem, get this fix! | Stefano Paganini: mining for web, marketing, technology, fun
Apple just turned your ancient AirPort Express router into an AirPlay 2 wireless speaker dongle - CNET
What's the Difference Between the AirPort Express, Extreme and Time Capsule?
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How to add an AirPort Express to an AirPort Extreme to extend wireless networks | TechRepublic
Update the firmware on your AirPort base station - Apple Support
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Apple AirPort Express Router 802.11n (1st Generation) MB321LL/A | mac of all trades