Lego Mindstorms NXT 2.0 is the second set from LEGO's Lego Mindstorms series, launched on August 5, 2009 at the Lego Shop in the U.S. The set contains 619 pieces, including a new sensor that can detect colors. It consists of a brain known as the nxt. When you buy this, you will be provided with an nxt software. Through this nxt software, you can program your robot. According to it's functions like it has to detect whether there is an object in front of it. After programing the software, we install in in the nxt, which is the brain of the robot.Different parts of the robot like wheels, hand, leg, sensor is connected to the brain. And when we start operating therobot acts according to how you have progrmed it.