The Flashbang is a thrown weapon featured in Grand Theft Auto: Chinatown Wars.
Flashbangs will temporarily stun anyone nearby. The playercan use the touch screen to throw Flashbangs at a distance in any direction.
It can be bought from Ammu-Nation for $150 per 8
Flashbangs after the mission Carpe "Dime".
The Flashbang seems to be a equivalent to the Tear Gas.