stun gun 
noun
A device used to immobilize an attacker without causing serious injury, typically by administering an electric shock.The Los Angeles Times newspaper has reported that the troops used a stun gun to administer electric shocks to a suspected resistance fighter....
- Three firearms, an electric stun gun and three canisters of CS spray were also recovered.
- For years, the company maintained that its stun guns never caused a death or serious injury.