Children will have a blast building and racing on this fast and fun techno gears marble mania twin turbo trax. After finish constructing the turbo trax the children can compete against each other as they race their marbles through this exciting marble speedway. Fun sound effects add to the excitement and the winning time is show on an LED display. Colors may vary. Requires two "AA" batteries and two button cell batteries. WARNING: CHOKING HAZARD - Small parts and marbles. Not for children under 3 years.