Software Developer Kit (SDK), includes information on host USB drivers, executable file format, and bytecode reference.

Several developer kits are available that contain documentation for the NXT: Lego has released the firmware for the NXT Intelligent Brick as open source, along with schematics for all hardware components. A black version of the brick was made to celebrate the 10th anniversary of the Mindstorms System with no change to the internals. The Intelligent Brick remains unchanged with NXT 2.0. Power is supplied by 6 AA (1.5 V each) batteries in the consumer version of the kit and by a Li-Ion rechargeable battery and charger in the educational version. It also has a speaker and can play sound files at sampling rates up to 8 kHz.

It has a 32-bit ARM7TDMI-core AtmelAT91SAM7S256 microcontroller with 256 KB of FLASH memory and 64 KB of RAM, plus an 8-bit Atmel AVRATmega48 microcontroller, and bluetooth support. The brick has a 100×60 pixel monochromeLCD and four buttons that can be used to navigate a user interface using hierarchical menus. The plastic pin to hold the cable in the socket is moved slightly to the right. It can take input from up to four sensors and control up to three motors, via a modified version of RJ12 cables, very much similar to but incompatible with RJ11 phone cords. The main component in the kit is a brick-shaped computer called the NXT Intelligent Brick. The third generation, the EV3, was released in September 2013. The second generation of the set, the Lego Mindstorms NXT 2.0, was released on August 1, 2009, featuring a color sensor and other upgraded capabilities. A variety of unofficial languages exist, such as NXC, NBC, leJOS NXJ, and RobotC. It comes with the NXT-G programming software, or optionally LabVIEW for Lego Mindstorms. The base kit ships in two versions: the Retail Version (set #8527) and the Education Base Set (set #9797).

It replaced the first-generation Lego Mindstorms kit, which was called the Robotics Invention System. LEGO Mindstorms NXT is a programmable robotics kit released by Lego in late July 2006. 'Golf bot' - a robot built with the NXT set.

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