If you have more than one AirPort Express, you can connect one to the stereo in your living room and connect another to the powered speakers in your den, for example. Using AirPlay, you can stream your iTunes music from any computer or wireless device on the network to any AirPort Express in your house.
You can also stream music to more than one AirPort Express simultaneously using iTunes, but only one device at a time can stream music to an AirPort Express.
