http://www.techradar.com/news/nest-hello-is-the-companys-first-smart-doorbell-and-includes-facial-recognition >Today Nest announced its entry into the smart doorbell market with the Nest Hello, a smart doorbell from the company that first made its name with smart thermostats.  >The Nest Hello supports recording in HDR, as well as a night-vision mode as seen in the company’s other smart home products.