I already have the Ring doorbell and have been quite happy with it -- and decided to add an indoor camera to my "Ring system" as well. The  Ring Indoor Cam is a great addition. It was easy to set up and I got it working quickly. I love that it is 1080 HD video and has two way talk for when we are not a home. No batteries are needed as you just plug it in to one of your indoor outlets. You set it up to your WiFi thru the Ring app -- 
I like this little camera so much I might just buy a couple of more !