Comes with a 1-year Onkyo Factory warranty only when purchased from an authorized Onkyo dealer, such as Amazon.com * 7-Channel powerful surround sound (130W per channel); Discrete amplifier design with Onkyo"s exclusive WRAT (Wide Range Amplifier Technology) * THX Select2 Plus certified Network Receiver with built-in Wi-Fi and Bluetooth; allows music streaming from Mac, PC, iPod, iPhone, iPad * 4K pass-through from compatible source devices and video up scaling to 4K with Qdeo Technology by Marvell (via HDMI); HDMI (8-in/2-out) with 3D and Audio Return Channel * Onkyo factory refurbished items are products, which may have been purchased and opened by a consumer, but have been tested, inspected, and repackaged by Onkyo. Items may have minor, if any, cosmetic damage.