Electronic Dice are the perfect promotional item for games of chance or gambling-themed promotions. Just roll or shake the keychain ball and motion sensors detect movement causing the LED die to electronically "roll". Die can also be activated with a built-in push/pull tab. When activated, the LED dots on the die blink and change and are accompanied by "beeping" sound effects. Sound effects and blinking start out fast and gradually slow as the number is selected. Each die measures 1 1/4" inside a spherical ball attached to a key ring, letting them easily fit in your pocket or purse. Individually polybagged. 2 button cell (LR44) batteries included.