"1, This train uses 4 AAA batteries. 2, This train's underneath contains a camera-light liked colour recognised sensor to recognise the action blocks. Actually you can replace the action blocks with the same coloured material like paper, the train can still read it and implemented the relevant actions. 3, The tracks are compatible with other Duplo's manual push trains, as long as you don't fit with a switch-track from other Duplo track set like 10882. You can push along the manial train with these tracks, or even connect the manual coach/car to this batteried train and pulled by it. 4, You cannot change the speed or this train manually on this physical train blocks. But you can choose the speed of this train via the free Duplo train app available in App Store. The default speed of physical train is maximum. You can slow it down only via this app. 5, This app connects between the device and the train via Bluetooth."