Features:

• Take the music from the iTunes library on your computer and sends it wirelessly to any stereo or speakers in your home
• Print wirelessly through AirPort Express--its almost like having a printer in every room of the house
• Wirelessly share photos, movies, and other files without having to worry about slow data transmissions
• The AirPort Express Base Station now features 802.11n, the next-generation high-speed wireless technology included with most shipping Mac computers and some newer PCs with compatible cards
• Industry-standard encryption technologies built into AirPort Express, including WPA/WPA2 and 128-bit WEP, plus a built-in firewall that creates a barrier between your network and the Internet

Editor Reviews:

Product Description:
Now with blazing 802.11n, the affordable AirPort Express is powerful enough to run a home Wi-Fi network, yet small enough to take on the road. Share your wireless network with up to 10 users, print documents, photos, and more from any room in the house to one central printer, play iTunes music through your stereo or powered speakers using AirTunes, and more.

Rating : - Simple, clean, functional, Apple.
I have 3 Airport Expresses in my home with which I stream my music to multiple speakers through iTunes. This is one of the main features of the Airport Express and it works flawlessly. If you are a Mac/iTunes user and want a way to "party-up" your house with continuous music from room to room, this is the way to go. It's easy to use, much less expensive than a Sonos system, and these units are great to travel with if you need to make a quick wireless network.