At first stun gun design proposed in 1952 for commandos operation. At first it make up as simple design. It developed by many changed. These stun guns were designed and adopted by some institution to control prisoners or prevent riots. The first modern stun guns were patented, featuring small battery operation electricity with high voltage and low amperage are work as its food. When it comes to self defense, few devices are as effective, or have such immediate. As a result, a stun gun purpose of a stun gun is to disable an assailant, giving you time to get away from a dangerous situation. As a result we are face safety by this at every time. At present many of people are used this for complete a crime. And for that it becomes a crime helper thing to us. So, we should not be used to defend you against an attacker with a firearm or knife.