One shell covering three stages: an adult pushes it at 18 months, a toddler walks behind it next, and by 36 months they scoot it along with their own feet. The detachable handle means it can stand in for a pushchair on a park walk, steering from standing height while a child rides in a car instead. The wheel turns 16 degrees each way, narrow enough that the front wheels cannot be cranked sideways, and it sounds a horn and engine note. A guardrail holds a rider on the 9.5-in seat. Rated to 55 lbs, ASTM and CPSIA tested.