Stun guns have been used by both civilians and law enforcement for many years. This is a non-lethal weapon that helps to immobilize an attacker before he or she can do harm to you.A stun gun requires you to have physical contact with a person. In order to deliver an electrical charge, you have to place the probes against the assailant. It will then deliver the electrical charge. You'll need to hold it there from 1-5 seconds in order to debilitate the assailant.Stun guns work by sending an electrical impulse into the body of the attacker.