The Gyroscopic Sensor lets you build LEGO® MINDSTORMS® NXT robots that can detect rotation using a single axis gyro based on a quartz resonator. Accurate readings require the gyro sensor NXT-G block or use of another programming environment to read the raw value from the sensor. Includes 1 Gyroscopic 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 (#8527 or #8547) for use.