With the switch OFF, the lead car can be charged by moving it back and forth with your hand.After recharging the battery, turn the switch ON to start electric driving.The speed is about 2 seconds for a distance of 30 cm, and about 7 m for a distance of 15 round trips. The car will travel about 7 meters.The amount of charged energy can be checked by the brightness of the LED light on the lead car.Each car can be connected and disconnected in a 3-car formation.One side of the intermediate car (lead car side) is a special coupling part for easy coupling.Rails not included.