Features:Automatic Laying Function - Dominoes will automatically cast the cards during the driving process after the placement is completed, and push the card and the dominoes will appear and have a chain-like effect that roll like a raceDominoes will automatically cast the cards during the driving process after the placement is completed, and push the card and the dominoes will appear and have a chain-like effect that roll like a race.This is a fun toy, especially if you and your kids/grandkids are domino-racing fans, can also be used as Christmas gifts, Halloween gifts, children's birthday surprises, and jigsaw puzzles, giving children a happy entertainment timeOur Domino-Train Blocks Set can develop children's athletic ability, color cognitive ability, teamwork ability. Colorful and beautiful appearance can stimulate their brain and thought-development.Can develop children's hands-on ability, color cognitive, artistic cognition, sensory, cognitive ability, imagination, and creativity.Notice:*Actual color may be slightly different from the image due to different light effect*Please allow 1-3cm deviation due to manual measurementDescription:Size: As the picture shownBattery: 1 x AA Battery (not include)