Airport Express supports both wireless Wi-Fi radio bands: 2.4GHz and 5GHz.
As many as 50 users can share the internet with this product. Even though the AirPort Express only has one local area Ethernet port, it has attributes that are lacking in its competitors. For example, the Express supports both 2.4GHz and 5GHz Wi-Fi radio bands. Independent test labs do not report extreme performance, but the ability to operate on a 5GHz network allows users to isolate and avoid the signal conflicts that sometimes plague the 2.4GHz frequency. Sources of signal conflicts on the 2.4GHz radio band include: garage door openers, microwave ovens, direct satellite service radio frequency leakage, cordless telephones, power lines and electrical railroad tracks.
Because it lacks multiple Ethernet ports, users often employ it to extend existing Wi-Fi networks hosted by more-capable wireless routers. The AirPort Express includes AirTunes, so it is optimized for streaming iTunes via remote speakers. Because it features an audio jack, it is possible to connect the Express to a home stereo system (or to powered speakers) so that iTunes can play on the stereo from a Macintosh or Windows machine. The audio jack is an analog and optical digital audio mini-jack. The device itself contains its own power plug integral to the unit. For those who want to locate the Express away from the power outlet or connect it directly to a home stereo, Apple sells an optional AirPort Express Stereo Connection kit with Monster Cables including a power cord, digital fiber optic cable and an analog mini-stereo-to-dual-RCA connector.
The Express is the only product among budget-conscious home wireless routers to include the convenience of a USB port for compatible printers. The USB-attached printer becomes a resource available to everyone on the wireless network