Essentially, once Marty identifies a hazard using its sensors, it stops in its tracks, changes its signature operating lights from blue to yellow, and repeatedly announces, “Caution, hazard detected,” in English and Spanish. One of several catches to their existence, however, is that the robots don’t actually clean anything.

Marty is advertised as an aisle-sweeping superhero, but it’s simply a messenger that shouts about a problem until a more capable human comes and removes whatever the hazard may be. Upon learning this fact, some people, like myself and the woman heard in this video shared by Twitter user @jennlynnjordan, are rightfully confused.