7-channel powerful surround supported in HD Audio format decoding: Dolby TrueHD and DTS-HD Master Audio; Dolby Digital Plus and DTS-HD High Resolution Audio
Network receiver with AirPlay, allows music streaming from Mac, PC, iPod, iPhone, iPad
4K pass-through for next generation super high resolution displays, and HDMI (4 in/1 out) with 3D and Audio Return Channel
AV Controller app for operating various functions from an iPod, iPhone, iPad or Android phones
YPAO sound optimization for automatic speaker setup
Great deal for this price; it's about time to be winding down on this and to start selling the new models, but this is an extremely capable unit, even if the YPAO isn't quite as good as Audyssey.