https://ring.com/Video/Doorbells
广告Effortless Installation. Explore & Expand Security Coverage For Your Front Door. Shop Now. Battery-Powered or Wired, Ring Has Smart Security Solutions for Every House or Apartment.
Works with Ring devices · HD Video w/ night vision · Dedicated 24/7 support
Types: Doorbell Camera, Outdoor Security Camera, Chime, Outdoor Security Sign
Ring's New Doorbell Has 1080p Video & A Swappable Battery –
TechCrunch