Today's award goes to the designer(s) and manufacturer of this product - not to mention all the shops that sell it.
It looks - and presumably behaves - like a miniature, low-power Taser. Trouble is, if someone hits me with an electric shock, no matter how small, I'm going to instinctively, automatically assume it's a real Taser. After all, that's what I'm trained for, having served as a prison chaplain! That means I'm going to respond violently, at least physically, and possibly with a firearm. Is that really what the designer of that product wants to happen?
They may have intended this to be a not-so-gentle reminder to observe safe social distancing, but the fact remains, to administer an electric shock to someone is technically and legally assault. It's a criminal offense (unless you're a cop trying to make a suspect stop resisting). That entitles the person being shocked to defend him- or herself against the assault.
I can see this leading to all sorts of complications . . .