LAXSUPIOT0002 is a Single Mercury Tilt Sensor which is used to sense movement (tilt) of a device above and below a horizontal axis, and it must be used with Advanced relay I/O controller. Motion sensors are very similar in design to tilt sensors; in fact, some tilt sensors are used as motion sensors. The sensor will be in one condition (open or closed) at rest. When it is subjected to motion it will continually change state as long as it remains in motion.