Thomas helps keep potty training on track with fun train sounds and a tune to reward every success! Three modes of allow Thomas Railroad RewardsPotty to “grow” with your child's training. First it's a potty seat with a built-in sensor that knows when to reward success with fun train sounds and music. The bowl easily removes for easy cleaning, and there's a built-in splashguard for boys. When your child's ready to transition to the toilet, the potty ring removes for use on most toilet seats, and the base converts to a sturdy step stool. Built-in potty ring handles on a seat that's just their size help toddlers feel secure on a big toilet, making the transition easier for everyone.