LEGO MINDSTORMS Sound Sensor (9845) Includes 1 sound sensor Does not include connector cable This is the individual component, and does not include the NXT Intelligent Brick, software or any accessories It requires the complete LEGO MINDSTORMS NXT set for use Utilizes the LEGO Technic building system for easy and more stable building with improved functionality and movement capabilities LEGO MINDSTORMS is age graded 10+ and is P/C MAC compatible