LED Impact Activated Bouncy Balls will have you bouncing up and down! Perfect for birthday parties, trade shows, holidays and more. Features See through rubber that shines brightly when LEDs activated To activate your LED Impact Activated Bouncy Ball Green, simply bounce it and watch it flash Specifications LED Colors: Green Modes/Functions: flash Battery: Non-Replaceable Printable: Yes Dimension: 1.5" Dia Weight: 0.12 lbs