The Chicco® Spring Roller is a motion activated toy that encourages crawling by playing a fun melody whenever the baby makes it roll. Once baby catches up to the Spring Roller, there are activities, lights and sounds, to entertain and to develop dexterity. The wheels rubber treads help prevent damage to floors. Measures 17.2'' x 11.4'' x 10.6''. Requires two AA batteries (included). Ages 6 months and up.