Fits in purse, blows bad guys away. What's not to love? There's self defense, and then there's self defense.
Of course, in most places the second a cop found one of these on you it'd be a short trip to a jail cell and a damned long series of court cases to get it back. Yeah, it's wrong, but them's the breaks.
Mark gets a no prize that, if a cop asks him about it, he must reply "yes sir I do sir and I'm keeping my hands on this steering wheel until you tell me what to do" for bringing us the ultimate in fashionable self-defense.