I scoured their website to look for any clues about how it might (allegedly) work and got a fat lot of nothing.
> Rest constantly monitors room air quality, using a proprietary algorithm to pinpoint any tobacco, marijuana, or nicotine presence.
So a smoke detector with an "algorithm" attached. Uh huh. How does that algorithm work?
> By analyzing various factors and patterns[...]
Some cutting edge shit here!
And as for accuracy, they don't even pretend to make promises about "99.99% success rates" or anything. This is the most detailed they get:
> Q: Is it accurate?
> A: Our sophisticated smoking detection algorithm has been tested for accuracy in real-world scenarios, backed by years of development, and tens of thousands of hours of rigorous testing and validation.
Given that this image: https://cdn.prod.website-files.com/653a9fbd1075088b6c8f8bd3/... shows PM2.5 and CO2(ppm) it may imply they monitor particles and CO2 levels. My guess is it also monitors humidity, and temperature. Humidity helps distinguish smoke from water vapor (eg. steaming shower).
My guess is it's likely a sensor in a hotel room accumulates dust over time, leading to high PM2.5 measurements maybe when something (eg. suitcase) bumps against the case, shaking the accumulated dust and releasing it around the sensor.
Note that pm2.5 will also spike when you've used shampoo, perfume, deoderant, lotion, sunblock; if you use dryer sheets and you unpack your clothes, etc.
It's going to be similar bullshit to what Halo uses in the highschool vape sensors. A bunch of particulate sensors for like PM1, PM2.5, PM10, sniffing out VOCs, and then they consider any tripping of any of that to be a "smoke" sesh.
Edit: Oh. Rest is just NoiseAware. They're just reselling NoiseAware sensors which are just - yes - a bunch of particulate sensors hooked up to an ESP32 hooked to a web dashboard.
Yeah the anecdotal evidence leads you to this as well - the hair drier usage leading to triggering the sensor. My PM/VoC sensors in my bedroom spike when my wife dries her hair while my CO/CO2 sensors do not.
> A: Our sophisticated smoking detection algorithm has been tested for accuracy in real-world scenarios, backed by years of development, and tens of thousands of hours of rigorous testing and validation.
I would be willing to bet a good amount of money they have a huge pile of nothing on this
On the other comment they say they monitor PM2.5, CO2 and humidity. Congratulations, your hot water shower with hard water just triggered the sensor. $500 fee.
> Rest constantly monitors room air quality, using a proprietary algorithm to pinpoint any tobacco, marijuana, or nicotine presence.
So a smoke detector with an "algorithm" attached. Uh huh. How does that algorithm work?
> By analyzing various factors and patterns[...]
Some cutting edge shit here!
And as for accuracy, they don't even pretend to make promises about "99.99% success rates" or anything. This is the most detailed they get:
> Q: Is it accurate?
> A: Our sophisticated smoking detection algorithm has been tested for accuracy in real-world scenarios, backed by years of development, and tens of thousands of hours of rigorous testing and validation.