The Wave Roller does not require any chains, batteries or pedals to create movement. It moves like a snake! The child simply needs to gently swing from left to ride with their feet on the front paddle in order to create forward motion. The Wave Roller steering is also operated by the feet. The Ezyroller is super fun and super easy to learn how to use and master for most kids. The Wave Roller is suitable for use indoors or outside as the wheels are non-marking. Sturdy Steel Frame. 2 steel extensions to grow with child. LED Wheels. Shock absorbers. Strongly made fabric seat. Hand Brake. Max Load 60kg. Ages 4 and up