Flash Grenade: When a flash grenade goes off there is a brilliant flash and a loud boom. Though no damage results, everyone in the area is momentarily disoriented by the flash and noise. Characters wearing sonic headphones are not affected by a flash grenade unless they are looking in the direction of the flash. Anyone outside of the area of effect has automatic surprise during the turn of the blast on anyone affected. Flash grenades are used by Star Lawmen to get the jump on terrorists or criminals.
 (source- Star Law Campaign)