I recently went through a similar process. Old house, no existing doorbell or wiring at all.
I wanted something with a battery, but also that had an SD card to record 24/7. Wyze didn’t offer both (and still doesn’t, really, see below) in one device so I bought:
Video Doorbell V2 (does have SD card slot)
A plug-in 24VAC/40VA transformer, $20
$5 worth of 18ga lamp cord.
The I posted here and found a number of posters using a similar setup with no existing doorbell wiring or chime. I already had a Cam OG, which could be used as a chime for the V2, and a handy outlet near the front door. I wired it up, everything worked great. The plan was to plug the transformer into the indoor outlet and run the cord through the wall next to the door to the exterior.
Just before I went to drill through the wall, though, they announced the Duo Cam doorbell. Runs off battery, so no need for a hole in the wall, has an SD card slot, and even comes with a chime. Perfect, right? Well…
Pluses for the Duo: I like the down-facing camera and the chime (it’s plenty loud enough for me).
Minuses: To do 24/7 recording, it has to be wired.
Didn’t find that out until I actually got the device and saw the manual. So with the SD card, you can still record events locally without a Cam Plus subscription, but I still may be making a hole in the wall. I guess I understand it, since it would eat the battery really fast, but I wish it was noted up front like on the web site or outside packaging. You can’t have 24/7 SD recording and be battery operated, still.
As others have noted, it also was released with SW bugs. Mine triggers almost immediately after the cooldown, every time, no matter how the sensitivity and detection zone are set. Kills your battery and sends lots of useless notifications. I’ve just turned event recording off and am hoping for a fix.