english: The neat thing about this is, you have a light source that flickers on and off at about 1,000 hertz, another light source that detects that light at 1,000 hertz, and so you can run this system in broad daylight.
non_english: Zgodna stvar kod ovoga jeste, da imate izvor svetlosti koji se pali i gasi na oko 1.000 herca. Drugi izvor svetlosti detektuje svetlost na 1.000 herca. I zato možete koristiti ovaj sistem u po bela dana.