Stun guns are used worldwide in the defense of bodily harm. Just the crackling sound from a stun gun will make most perpetrators run for their lives. Touch them with the stun gun and they will know what real pain is.
A stun gun keys into the nervous system dumping energy into the muscles. This causes a loss of balance leaving the assailant disoriented and confused. The longer you hold the electric prongs on a would be assailant, the longer the effects.