ok, i spent 5 minutes and i still have no info how it actually communicates? wifi, wifi radio, bluetooth, ultrasonic chirps, modulated light, all of the above?

ok, i spent 5 minutes and i still have no info how it actually communicates? wifi, wifi radio, bluetooth, ultrasonic chirps, modulated light, all of the above? i would have thought frst thing to say, it tends toi make me suspicious, but they look like good guys, just lacking some transparency at this stage.