Flashbang

A Flashbang  (can also be called a Stun Grenade) is a small explosive device that, when thrown, emits a large flash of light and a very loud bang that temporarily blinds and deafens those affected in the vicinity. They are commonly used by military forces in house clearing and surgical raids.

Battlefield 2: Special Forces
In Battlefield 2: Special Forces, the Flashbang is a new gadget added to the Assault kit. It functions just like normal, as they blind and deafen anyone caught within the blast radius. This effect is amplified on targets using night vision goggles. It also affects teammates, even if friendly fire is turned off. A total of 3 flashbangs are given to the player.

Singleplayer
Flashbangs are not available for use by the player but they do appear in the Singleplayer campaign as traps.

The traps in the mission Upriver trigger Flashbangs which temporarily blinds the player and attracts the attention of a number of Bolivian militiamen who then ambush the squad.

In No One Gets Left Behind, there are a few traps armed with Flashbangs. When the player meets up their squad and looks down on the first camp, the player can go right or left. There is a little hidden way that ends at the first prisoner the player can rescue. On this way, there are three Flashbang traps that the player can disarm.

A Flashbang is later used by a Russian soldier 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 towards the direction of the blast.

Singleplayer
Flashbangs make an appearance in Battlefield 3, again as a Singleplayer-only gadget. The item is used during Operation Guillotine as the player storms the vaults of the bank in Tehran, to stun the enemies at the entrance of the elevator shaft. Also, several enemies on the same mission use Flashbangs to serve as distractions for the player.

Dima also throws a Flashbang at the computer room of the bank during Comrades to temporarily halt the insurgents guarding the nuclear case.

It is also being used by Cole's squad in Night Shift while assaulting the presumed apartment of Faruk Al-Bashir.

but it makes its last apperence with enemies using Flashbangs against the player in The Great Destroyer.

Trivia

 * In Battlefield: Bad Company 2, if you look closely at a Flashbang near a tripwire, the name "Global Decal" is written on there, meaning that this (fictional) company manufactured them. Also, the phrase "Made with pride in Sweden." is written as well, which is a reference to the country DICE is located in.