Stun Guns use high voltage and low amperage to disable an attacker for several minutes. The stun guns does not rely on pain for results.
The energy stored in the gun is dumped into the attacker's muscles causing them to do a great deal of work rapidly. This rapid work cycle instantly depletes the attacker's blood sugar by converting it to latic acid.
The stun gun also also interrupts the tiny neurological impulses that control and direct voluntary muscle movement. When the attacker's neurological and muscular system is overwhelmed and controled by the stun gun, he loses his balance.
Shoilud the attacker be touching you, the current will not pass to your body!