Product Details Intelligent brick with 32-bit microprocessor; more memory and flash Three interactive servo motors features built-in rotation sensors that aligns speed for precise control and new sound patterns and tones 577 specially selected LEGO TECHNIC elements for sturdy and durable building and improved functionality and movement Icon-based drag-and-drop program building environment 6 AA batteries required which is not included Product Description Sure, Mindstorms NXT is a toy, but it is an important toy, like a piano or a chemistry set. It's one of those items that engages an imagination and possibly opens doors to new interests. Since our future is surely to be shared with robots--it's already started happening, just look at Roomba--those robots will need, at least initially, humans to program and maintain them. Those people, years from now, will likely remember their experiences with Lego Mindstorms. Out of the Box The main part of the kit is the NXT itself. It's about the size of an iPod (though a bit thicker) with a a loudspeaker, a monochrome LCD, and navigation keys on the front. This is the controller for the robot--it's brain, if you will.