When pressed, the bubble will make a slight bang. Then flip it over and start over! It can be reusable. It’s tasteless and harmless to people and pets. Bright colors and pleasant sounds are sure to satisfy any child! Ideal gift for your friend. It’s super simple and quick to get started. Logical reasoning, planning ability, prevention of brain degeneration. Exercise in 2 minutes for brain warm-up. Portable, anytime, anywhere, super lightweight, no accessories.