The idea is to stun the enemy to inaction. Stun devices send persons hit with it to electric shock. Because electricity is used and because it is non-lethal, there is a controversy about the legality of its use. Its immediate harm is pain, but experts say that continuous use can cause cardiac and other health problems. It might be a boon to people in distress but serious training on its use and possible side effects is necessary.

An M18 taser is just one such device. Claimed to be excellent for personal security, Tasers are non-lethal but effectively disabling. The big advantage is that it can be used from a distance. Modern designs are small and can easily fit in a handbag. It seems like a useful security devise but its use is filled with controversy. It is always a good idea to check with the police before getting a taser gun for personal use.