Look at the change in the numbers....
![kochiya sanae and tatara kogasa (touhou) drawn by mizuki_hitoshi](/data/__kochiya_sanae_and_tatara_kogasa_touhou_drawn_by_mizuki_hitoshi__b52a4bd03469ad41718542d0b5e75b03.jpg)
Artist's commentary
Hang in There, Kogasa-san 3308
It doesn't actually make a "bee-bee-beep" noise, though! That would be annoying, of course. :-)
The motion sensors used something called a "Kalman filter" to detect movement, but I have no idea what that is. Intelligent people are incredible, aren't they?