Important NoteThe Micro Sonic Grenade already has a battery installed, however you need to pull the black tab underneath the battery to activate the Grenade the first time you use it. Simply peel back the silicone cover near the bottom of the Grenade where the battery is. Find the black tab and remove. Ready to rumble!Product Features * For ages 14+. Not suitable for children due to small parts and loud sound. * Office prank grenade to blast your coworkers" eardrums * Set the timer to 5, 30, or 60 seconds * Hide or throw the grenade near your target * Run away (but not so far away that you can"t enjoy their suffering) * Siren is 110-115 decibels, about the loudness of a sandblaster or power saw * Batteries Included * WARNING: Avoid prolonged exposure to alarm siren.