A stun gun is designed to immobilize an attacker without causing serious injury through the use of high-voltage electricity. Stun guns are considered close-proximity weapons because you have to physically touch someone with the device for it to work. They are used as a deterrent to temporarily disable an attacker to provide an opportunity to escape safely. When the stun gun is activated electricity pulses between two metal prongs. You must touch the attacker with the stun gun with the prongs sending an electric current at the point of contact.