Record & Play: Customise the play by using the red button on top of the engine to record your own sounds. As the engine passes through the orange Sound Action Tunnel, it automatically responds by playing your recorded sound. Honk, honk!. Pair the engine with the Smart Tech Sound app and you can customise the sound environment even further.Battery-powered: Control the trains motion using the three buttons on top – forward, stop and reverse. With 4-wheel sets, including a bigger third wheel set for stronger grip and a flexible boogie tail, this engine is one of the strongest in BRIO World and ready to pull many wagons and carriages.Interactive Features: The added Smart Tech Sound technology allows the engine to communicate with its surroundings, automatically responding to Smart Tech accessories with various train actions that enhance the imaginative play like multicolour lights, motion and sounds.