A Panerai Luminor watch belonging to Tony Fadell, co-founder and chief executive officer of Nest Inc., not pictured, is arranged for a photograph on top of a Nest Project smoke detector in Palo Alto, California, U.S., on Tuesday, Aug. 18, 2015. When Fadell isn't rethinking basic parts of your home, he collects watches. But he doesn't just like them, he has a seven-figure collection, and, more important, he really knows watches. Photographer: David Paul Morris/Bloomberg via Getty Images
