Here the pull-in and drop-out boundaries are shown in a frontal view. With the magnet shown above these lobes, the contacts are open in the sensor below on the PCB. If the magnet were to move vertically downward and enter the purple pull-in boundary the contacts will close. As long as the magnet stays inside the purple boundary the contacts will stay closed. If the magnet is withdrawn moving vertically upwards, the contacts will open once the magnet reaches the end (or top) of the light orange boundary.