https://ring.com › Video › Doorbells
赞助Ring Smart Video Doorbells: Help Monitor Home Anywhere. Expand Your Security Today. Battery-Powered or Wired, Ring Has Smart Security Solutions for Every House or Apartment.
Let Alexa get the door · Motion detection · Live-view · Slim, low-profile designs
Models: Battery Doorbells, Video Doorbell 2nd Gen, Video Doorbell 3, Video Doorbell 4
Ring's New Doorbell Has 1080p Video & A Swappable Battery –
TechCrunch