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Wired Sensors
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Recommended
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Wired Smoke Detector for 12v Normally Opened or Normally Closed (NO/NC) Alarm Systems - 12 Volt
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Free shipping
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6% less than eBay
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![Wired Magnetic Contact Switch for Doors and WIndows (Normally Open & Normally Closed) [White Strip]](http://shieldtechsecurity.com/var/images/product/262.262/stsw-wcst1-x358.png)