The AVR-E400 7.1 Channel Network Home Theater Receiver from Denon provides powerful surround sound performance with advanced networking technology. Network functionality supports Internet radio services such as SiriusXM and vTuner, as well as Apple's AirPlay technology. The sophisticated video processor includes video up-conversion, along with 4K Ultra HD for the next generation of 4K Ultra HDTVs. Additionally, a simple interface provides quick-and-easy setup, so you can start enjoying your multimedia right away. Setup is simple, thanks to the on-screen graphical display, which combines large, clear text and icons, so you can easily make adjustments and settings during setup to quickly and easily optimize the AVR-E400 for your particular speaker setup and source equipment. The exclusive Denon Setup Assistant easily walks you through the whole process. The Denon easy-connect speaker connections on the rear panel are spring loaded and color-coded for quick connection, and the supplied color-coded speaker cable labels ensure correct speaker-cable hookup the very first time. The easy-to-use remote control features discrete source selection buttons that let you choose your preferred source with the touch of one button, so there's no need to toggle through all the inputs to choose your preferred source component. Exceptional sound anywhere you want it - really, anywhere. The compact Atrium® 4 Outdoor Loudspeaker meets or exceeds military specifications for environment endurance. Its small size makes it ideal for tight, out-of-way installations: by the pool, next to the deck or patio, around the kitchen, tucked away in the family den or filling the backyard with great sound. The easy to mount Atrium 4 will deliver high performance audio fall, winter, spring and summer, bringing years of outdoor enjoyment.