Sometimes it's the little things: the audio out jack on the AirPort Express glows red when you start playing music and there are no speakers plugged in : r/apple
AirPort Express A1264 - iFixit
New Apple AirPort Express (2nd Generation) - 2012: Unboxing & Review - YouTube
Amazon.com: ShineBear Airport Express A1392 MC414LL/A 802.11n 600 Mbps 1- Port 10/100 Wireless Wi-Fi Router AirPlay WiFi for Apple - (Cable Length: US) : Electronics
How to Use an Ethernet Switch with AirPort Express | Router Technical Support
Amazon.com: ShineBear Airport Express A1392 MC414LL/A 802.11n 600 Mbps 1- Port 10/100 Wireless Wi-Fi Router AirPlay WiFi for Apple - (Cable Length: EU) : Electronics
AirPort Extreme - Wikipedia
APPLE A1392 2ND GEN AIRPORT EXPRESS BASE STATION WiFi ROUTER C86NCDG9DV2R | eBay
airport express ports airplay - Average Tech Blog | Home Automation
AirPort Express 802.11n (2nd Generation): Guide to ports and connectors | Airport express, Apple support, Generation