The Ring Video Doorbell is a smart home security device that allows you to see, hear, and speak to visitors at your door from anywhere. It features a wide-angle HD camera with night vision, motion detection, and two-way audio, so you can stay connected to your home
From Wikipedia
Ring LLC is a manufacturer of home security and smart home devices owned by Amazon. It manufactures a line of Ring smart doorbells, home security cameras, and alarm systems. It also operates Neighbors, a social network that allows users to discuss local safety and security issues, and share footage captured with Ring products. Via Neighbors, Ring could also provide footage and data to law enforcement agencies to assist in investigations with user’s consent constraint.