This page provides a list of products that work well with the VEX Robotics Design System right out of the box.

PIR Motion Sensor

This is a “Passive Infra-Red” motion sensor that triggers a digital input port when motion is detected.

Available from Radio Shack, Parallax

Cup Magnets

These are handy for quickly attaching & removing VEX electronics modules.

Their 8-32 threaded stud fits VEX fasteners.

Available from Amazing Magnets