I just find it funnier that they have to ring the bell. Human nature to press the button.
Also thinking about it I have a doorbell like that and it rings every time a bird flies past. It is supposed to not detect birds, leaves and people driving past on the road, it's supposed to only detect humans but it 100% doesn't work. I can totally see something like this malfunctioning and just going off because a leaf got blown past it.
Its a wireless camera door bell, called "ring".
No idea if this is real but i assume you could set something like this up to be either motion detection activated(like a mine) or remote activated by looking at the camera feed.
It doesn't stream video full time, it detects motion and then let's you optionally turn on video. (Maybe that changes if you have zonal movement detection but it's probably locally processed)
I can think of about 500 easier ways to do this. I can't imagine them doing it the complicated way, when the easy way works just as well, costs less, and is less prone to malfunctioning.
Russians deliberately don't attack telecom infrastructure now, because they did initially before discovering it was actually necessary for their own military comms.
Mobile routers can last 12 hours and handle a handful of connections, you can probably supplement them with a usb battery bank too.
Or if there is grid power within WiFi range it's not an issue. Or there may be more quiescent current models designed for IoT applications (like wind sensors in trees which may have poor signal coverage), I don't know
One time I went to Egypt and there was just a random ass power outlet on a rock in the desert. To this day I have no idea why it was there or if it was connected to anything