From what I have seen posted here on WS, the brand of baby monitor in the Watts home was Summer Infant baby monitor. You can see it listed on Walmart's website.
Ashleigh Banfield had a segment showing the baby monitor. I don't have cable so I have to wait a few days to see if AB posted it on her website.
I specifically posted questions about the baby monitor and Ring doorbell to SW's friend
@isalybra but they weren't answered. I'm not sure that she saw my list of questions or got overwhelmed because I asked so many questions of her.
So, I think this is what is known:
1. Baby monitor is Summer Infant brand not certain of the model. The displays cuts between the 2 cameras in the girls rooms. When there kids' bedroom lights are out, the image displayed looks like a fuzzy, high-contrast B/W image tinted in a blue hue. There is no way that CW could have determined that Bella's skin was blue from rigor mortis. It probably wasn't even possible that rigor had set in by that time.
2. The doorbell was Ring brand doorbell. It was activated by a motion sensor --- the person coming up to the door. The doorbell didn't have to be rung in order for it to notify the homeowners. We don't know the plan that the Watts had --whether it included transmitting to an independent Cloud besides calling CW and SW's phones. Ring doorbell me is wireless wife.
I believe that CW+SW's phones might still have on them what the Ring doorbell was seeing. That's how they would know who is at their door.
Surely CW wouldn't be dumb enough NOT to disable Ring if he's having lovers coming to the house. Who knows? Maybe he wanted to get caught by SW.
He was passive/aggressive. He would probably force her to make the decision about separating so he could blame everything on her. "She made me do it!"
WS sleuths, please correct me if I'm wrong about the above. I haven't been able
to read everything.