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The programmable Lego brick which is at the heart of these robotics sets has undergone several updates and redesigned, with the latest being called the 'NXT' brick, being sold under the brand name of Lego Mindstorms NXT 2.0. The set includes sensors that detect touch, light, sound and ultrasonic waves, with several others being sold separately, including an RFID reader.
The intelligent brick can be programmed using official software available for both Windows and Mac computers, and is downloaded onto the brick via Bluetooth. There are also several unofficial programs and compatible programming languages that have been made to work with the brick, and many books have been written to support this community.
There are several robotics competitions which use the Lego robotics sets. The earliest, and likely the largest, is Botball, a national U.S. middle- and high-school competition stemming from the MIT 6.270 Lego robotics tournament. A related competition is FIRST Lego League for elementary and middle schools. The international RoboCup Junior football competition involves extensive use of Lego Mindstorms equipment which is often pushed to its extreme limits.