Its Basically two kids or three with a 3/4 full pepsi bottle with dry ice added and close lid. Throw and boooommm! Its pretty loud. Its like taking empty two liter jugs and taking the cap off and puting one of those tire vavle stems threw the cap and screwing it on the empty bottle and fill it up with air till it blows up. Its as loud as a sawd off shotgun. TRUST ME its loud.