Use a mobile phone or tablet to drive this clever little engine forwards, backwards or to a stop. It comes with a free Bluetooth app that also lets you adjust the speed and play five cool sounds. Can also be operated using the buttons on top. Download the free app to control the engine via your mobile phone or tablet. Control options include forwards, backwards, stop, speed control, and five different sounds. App download instructions included. Bluetooth device required. Buttons on top of the engine can also be used to control basic operations. Details:Blue11.81" x 11.81" x 5.91" package sizeDownloadable app (requires smartphone or tablet)Includes charging cableFor ages 3 and up