Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
A magnetic sensor (also called a “contact” or “switch”) is a two-piece device that forms a circuit when closed. When the two pieces separate a signal is sent to a control panel.