Website says it’s a .380. Still in development.
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One of the harshest shooting handguns I've ever fired was my HK4, with the .380 barrel installed -- until I spent a lot of work removing all traces of mold flash and all other "sharp" surfaces from its plastic uni-grip. It was so bad that I -- an experienced shooter of larger calibers -- would not shoot it without my Nomex gloves -- until it was "tamed".
Even so, the HK4 grip was designed to fit the human hand -- and this piece of junk is definitely not so designed.
And, the HK-4 is a "full-sized" .380 -- not a "mousegun" like some Kahrs, Rugers and Seecamps...
My prediction is that someone might get off one shot with this thing, but would suffer so much hand trauma that they would either drop it or recoil in pain -- and never fire the second barrel. Especially so, if the upper barrel is the first to fire...
This panic is to be expected from hoplophobes.