[kedikedi]

Interesting approach. I have a feeling that this is intended for sparsely built houses (the typical american housing maybe?) since in a dense European city I’d imagine it would pick up tons of cell phone signals from other people in their own homes or, say, from people visiting the downstairs coffee shop terrace.

[petesergeant]

From their website:

> Our service is ideal for detached homes, where our calibration (small, medium or large homes) lets the sensor distinguish between mobile phones on your property and those nearby. It is not suitable to homes (e.g. apartments) that share walls with other homes.

[defrost]

The 'fix' for that (applicable in some areas, not so much in others) would be to remember phone ID's and focus on numbers (and strength) of new ID's during the rental period.

A downstairs coffee shop would be a semi periodic flux of a particular size, a party would be a surge over and above that flux and persisting outside of coffee shop hours.

Again, pattern learning is only applicable in some scenarios .. but effective enough in those.

[Gigachad]

Phones randomize mac addresses so that probably wouldn't work. Presumably you can get a read on how many devices are scanning at once, but not track them long term.

[altairprime]

One could safely assume that such a tool would likely be illegal in the EU, anyways, since that’s rather a lot of data collection activity to expose a homeowner to.

[Gigachad]

They claim on the website that their product is GDPR compliant. They aren't collecting any personally identifiable data.