Flashbang

A Flashbang is a small explosive device that causes a large flash of light to temporarily blind those affected.

Battlefield: Bad Company 2
A flashbang is used by an enemy during Zero Dark Thirty, when the player enters a small sewer area around the end of the mission. It will only blind the player for about 3 seconds, if the player is even looking in the right direction. It is the only time it is used in-game and it is never available to the player.