Stun guns are pretty much useless for self defense. As was said they are pain compliance weapons as in "stop resisting 'zap' handcuffs" Unless you plan on holding it on them until the cops arrive they will just get up and keep going. I wore out a stun gun on myself trying to prove to friends that it is a horrible idea. If a EDW is going to be used it should be a TASER that actually fires the probes.