I have used both stun guns and Tasers, and had both used on me at work. LE in the US who carry Tasers have to video the officer getting zapped with one as part of the training because if one is sued, one can prove one knew the effects of the weapon. Makes no sense, I'm carrying a pistol and a rifle too, are we gonna shoot each other with them so we know the effects? Like much else promulgated by our alleged masters, stupid. Tasers work, stun guns do not. The difference is the distance between electrodes. Every muscle between the electrodes is made to tense and release about 60 times a second or something.
So here is the difference-
300,000 Volt stun gun with about 3 inches between the electrodes applied to my pectoral muscle made the muscle jump, it hurt a little but not much. If someone offered me $50.00 each time I did that, I'd be rich within a week and they'd need new batteries. Little red marks if clothed, slight burns if not. Just nothing to it.
50,000 volt Taser one electrode on left shoulder, one on belt, both on my back. Very unpleasant. I have to say, I'd do it again, but if willingly it would cost someone about $50,000.00 a time. If unwillingly, we'd have a real fight to the death and if they did it anyway, they better look over their shoulder for the rest of their life and avoid open spaces, crowds, and windows.
With a Taser, everything between the electrodes just locks up quivering at 60 hertz or thereabouts, the more muscle one has, the better a Taser works. I fell down and couldn't move every time it was done. Longest 5 seconds of my life. From what I have seen VERY few people were unaffected. The only one was a meth head who was about 6'3'' tall and about 130 pounds, so taller than normal and very skinny.
I carried a Taser for 3 years and never used it on anyone, because it's possible to kill someone with it if their heart is at the wrong point of the rhythm and if I'm gonna kill someone, I will do it intentionally and not by accident. I owe even a criminal who is fighting me that much respect. Also, you have seen my reaction above, and I did not want to be looking over my shoulder all my life because I had done that to someone over a triviality. Pepper spray or tear gas is better if legal in the country, falling that, any kind of spray that shoots a straight stream and would temporarily blind someone is just fine, better if it is flammable in case you want to light it. Once they are blinded, you can either leave, or indicate your displeasure in a physical manner. You do know most spray insecticide is really some form of dilute nerve gas, don't you? Can't remember if it is Sarin or Tabun, but it's something like that. If you have in your country something called "Black Flag" spray insecticide, that's because some militaries use a black flag to notify personnel they are under gas attack, this since about WWI. They have Black Flag in the US and Europe, and I've seen it in Afghanistan.
Believe nothing you see on TV about this any more than you would about firearms, it's all BS. There is NO directed energy weapon on planet earth that if you apply it to a person, they just go unconscious like on TV. Stun guns don't stun, after you use a Taser the person is not stunned--they may be dead if their heart happened to be at the wrong point of rhythm, but they will otherwise be conscious unless they hit their head when they fell or something. Or maybe you triggered an epileptic fit or some other non-normal event.
I have no knowledge of Indian or other than US law, and not every state in the US, so know your local law before taking advice from anyone, including me.