Just found this post
EZVIZ Releasing New Doorbells DB2 and DB2 Pro, it would appear @yippie
Yippy got an email back from EzViz and no it doesnt support rtsp recording. I think the amazon reviews may be mixed DB1 and DB2...
Id like 24x7 recording at the front so I was planning to put this into zoneminder and let it be a door bell, but if its rubbish then I'll probably go with Eufy 2k (Had that before and its excellent) and a separate rtsp compatible camera (maybe eufy again).