
1) British invention 2) Swat team weapon
Found on
https://www.crosswordclues.com/clue/stun-grenade

A stun grenade, also known as a flash grenade or flashbang, is a non-lethal explosive device used to temporarily disorient an enemy`s senses. It is designed to produce a blinding flash of light and intensely loud noise `bang` of greater than 170 decibels (dB) without causing permanent injury. It was first developed by the British Army`s SAS in...
Found on
http://en.wikipedia.org/wiki/Stun_grenade
No exact match found.