How To Use AirPlay to Stream Videos, Music, and Photos Wirelessly from iDevices. By enabled AirPlay you can enjoy streaming videos, music, and photos wirelessly from your iDevices or iTunes on your computer. You also can these to your HDTV and speakers via Apple TV (2nd and 3rd generation), or to your AirPlay speakers or receivers, including AirPort Express. It promises really great multimedia experiences.
AirPlay is supported in most iDevices, include Apple TV, Apple TV (3rd generation), iPad, iPad 2, iPad 2 Wi-Fi + 3G, iPhone 3GS, iPhone 4, iPhone 4S, iPod touch (2nd generation), iPod touch (3rd generation), iPod touch (4th generation).
To get full AirPlay features to stream videos, music, and photos wirelessly from iDevices, make sure your AirPlay-enabled devices are running the latest software updates. While to stream content to AirPort Express, applies only to models that can update to AirPort firmware 7.4.2 or later.
If using an iPhone 4S, iOS 5.1 and later is recommended when streaming audio to an AirPlay audio device. While for Apple TV, it requires an active Internet connection in order to stream protected content via AirPlay. For information about troubleshooting AirPlay or AirPlay mirroring, see Troubleshooting AirPlay and AirPlay Mirroring.