https://ring.com/VideoDoorbell/2ndGen
赞助Discover Ring Smart Video Doorbells: Monitor Home Anywhere. Expand Your Security Today. Join Millions of Satisfied Customers and Choose Ring for All of Your Home Security Needs.
Two-way talk · Motion detection · Works with Alexa · Order now
Models: Battery Doorbells, Video Doorbell 2nd Gen, Video Doorbell 3, Video Doorbell 4
Ring's New Doorbell Has 1080p Video & A Swappable Battery –
TechCrunch