LEGO MINDSTORMS NXT is a popular robotics kit commonly known as the NXT set. There are currently two retail versions of the NXT set: the NXT 1.0 set (#8527) and the NXT 2.0 set (#8547).
The LEGO MINDSTORMS NXT 2.0 set (#8547), released in 2009, is the latest set in the MINDSTORMS series of robotics kits. Often known simply as the NXT 2.0 set, this kit offers several hundred LEGO TECHNIC pieces and an excellent selection of electronic pieces: a microcomputer, three servo motors, four sensors, and electrical cables. Also included is the graphical NXT-G programming software.
The LEGO MINDSTORMS NXT set (#8527), released in 2006, was the first major MINDSTORMS release since 2001. The set, now commonly known as the NXT 1.0 set to distinguish it from the NXT 2.0 set, introduced the powerful NXT microcomputer, servo motors, and ultrasonic sensor. The NXT 1.0 set is no longer in production and can only be purchased on places like eBay and the Amazon marketplace.