Yamaha factory refurbished items are products, which may have been purchased and opened by a consumer, but have been tested, inspected, and repackaged by Yamaha. * Yamaha factory refurbished items may have minor cosmetic damage. * The Yamaha factory refurbished RX-V373B comes with a 1-year Yamaha factory warranty only when purchased from authorized Yamaha dealers. * 4K pass-through for next generation super high resolution displays, and HDMI (4 in/1 out) with 3D and Audio Return Channel * YPAO sound optimization for automatic speaker setup