A stun grenade is a thrownweapon that appears in Fallout: New Vegas, Fallout Tactics and Van Buren. Stun grenades, also known as flash grenades or flashbangs, are non-lethal grenades used to disorient and distract targets by producing a blinding flash of light and loud sound, without causing permanent damage. The bright light over-stimulates the nerves in the eye, causing temporary blindness, and the loud sound causes temporary hearing loss and loss of balance from disruption to the fluid in the ear.
This grenade cut from Fallout: New Vegas was meant to inflict fatigue damage to targets, allowing for a less-lethal explosive weapon. Typical of stun grenades, a bright light accompanies the detonation, which can momentarily blind or blur vision.