Your little builder will love this Gearation set from TOMY. The set includes 11 colorful, turning, interlocking gears. Your child can turn it on, add gears and watch as they flip and turn. Control the speed with the fast or slow button. The magnetic board allows your child to arrange and rearrange them. It comes with a battery-operated central gear with an on/off switch. It requires 1 C battery, sold separately.