Here is some information on the newest version of the Lego Robotics System. The RCX has been replaced by the NXT (above).
The robot's "brain!"
The
all-new NXT Intelligent Brick, your robot’s “brain,” features a
powerful 32-bit microprocessor and Flash memory, plus support for
Bluetooth™ and USB 2.0! The NXT intelligent Brick includes:
 | 32-bit ARM7 microprocessor. |
| Support for Bluetooth wireless communication. |
| 1 USB 2.0 port. |
| 4 input ports. |
| 3 output ports. |
| Powered by 6 AA (1.5v) Batteries, not included, or lithium Rechargeable Battery (#9798), sold separately. |
| Up to three NXT Bricks can be connected at the same time; however, you can only communicate with one NXT Brick at a time. |
| This is the individual component, and does not include any sensors, motors, cords, software or other accessories; for the complete LEGO® MINDSTORMS® NXT set, please see below. |
Source: LEGO Store - LEGO Mindstorms NXT
The next generation of robots!
Create the smartest, strongest and most advanced
LEGO® robot ever, in as few as 30 minutes! The new NXT Intelligent Brick,
your robot's "brain," features a powerful 32-bit microprocessor
and more memory, plus support for USB 2.0, Bluetooth and more!
A highly versatile palette of LEGO TECHNIC® elements combines with
state-of-the-art ultrasonic, sound, light and touch sensors in the next
generation of intuitive robotics. With included Quick-Start guide,
easy-to-use software and step-by-step building instructions, beginners and
experts alike can create humanoid, vehicle and animal robots that obey
every command!
Improved light sensors can detect different colors and intensities, while
the new sound sensor enables robots to respond to sound patterns and
tones. Robots can really "feel" with improved touch sensors,
while ultrasonic "eyes" measure distance and movement.
Programming software is now available for both PC and Macintosh, plus with
Bluetooth support, you can even command your robot from your mobile phone!
LEGO® MINDSTORMS® NXT Includes:
| All-new NXT Intelligent Brick with 32-bit microprocessor, more memory and FLASH |
| 3 Interactive Servo motors feature built-in rotation sensors to align speed for precise control |
| New sound sensor reacts to sound commands, patterns and tones |
| New ultrasonic visual sensor responds to movement |
| Improved touch sensor reacts to touch and release |
| Improved light sensor detects different colors and light intensities |
| 519 specially selected LEGO TECHNIC elements for sturdy and durable building and improved functionality and movement |
| 4 input ports, 3 output ports and 7 6-wire cords |
| Matrix display |
| Real sound speaker |
| USB 2.0 and Bluetooth support |
| Easy-to-use PC and Mac compatible interface |
| Intuitive, icon-based drag-and-drop program "building" environment |