Once you are completed with your airsoft grenade it is time to test it out. Remember the snap clappers explode on impact with something so even dropping it slightly will set the whole thing off. I would recommend doing this outside. Position yourself away from a hard surface like a driveway or even a tree. Stand back aways, as far as your comfortable with. Throw the grenade and ...... BOOM!!!! These are so fun to use in airsoft and are extremely effective.