Function: the doll is mounted to the bicycle (Note method of installing, do not force hard loaded, easy to broken plastic doll). Tops on the bike at the beginning of the trunk two AA batteries , and then open the bottom of the trunk is not, will be very simulation doll cycling Oh, and the doll's feet will move, like a real person in Cycling , and with music and lights Oh, very fun a toy. THIS PRODUCT IS MOST WELCOME AMONG KIDS !