Smart Tech Sound Record & Play Engine 33971The BRIO 33971 Smart Tech Sound Record & Play Engine is more than just a toy it's an interactive learning tool. The set includes a unique record and play feature, allowing children to record their sounds using the red button on the engine. As the engine passes through the orange Sound Action Tunnel, it automatically plays the recorded sound, adding a delightful layer of interactivity. Pair the engine with the Smart Tech Sound app to further customize