Yeah but the reality of the microSD card is weird. E.g. Eufy puts the video on the card but encrypts it so you have to pull it through the camera through the app to your phone.
It's hilariously crazy but we were given the cams as a gift so we stuck with them.
That's always annoyed me about Eufy, but it hasn't been a practical problem given they're mounted in hard-to-reach areas. I think the feature is to avoid a thief being able to view the footage. I like that they support RTSP access for a NAS/live viewing without their bloated app.
From the product description though it sounds like sleep analysis is what you're paying for, which they do on servers analyzing the video.