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The most basic sensors of any alarm system is a door and window Surface Mount Magnetic Contact Switch. This type of contact switch is for normally closed circuits; this means that the when the magnets are lined up, the switch is closed. This type of setup is ideal for monitoring doors, windows, and sliding doors.
Mfr. # SM-200QBR
WARNING: This product can expose you to chemicals including Di(2-ethylhexyl) phthalate (DEHP),which is known to the State of California to cause cancer. for more information go to www.P65Warnings.ca.gov
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