Browse to: http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?mco=AB47AE5&fnode=home/shop_mac/mac_accessories/airport_wireless&nplm=M9470LL/A
or find airport express in the apple store and from there, you can find all the info you need. It's airport express that does airtunes though.
