Here is a video on the sound grenade from Valken Tactical that can be used in airsoft, the Thunder-V... "The Valken Thunder-V Distraction Device is a sound grenade intended for use in both civilian wargames and professional training. The realistic form and function of the sound grenade make it perfect for clearing rooms and bunkers of simulated adversaries. The reusable core fits in all available shell styles to fit your system. Order yours at Valken.com."