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1 Mini Recessed Door Contacts Brown NC Security Alarm Door Window Sensors W/Magnetic Reed Switch. These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems: Amazon.co.uk:
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1 x Electrotec CO03 Burglar Alarm White Surface Door Contacts - 5 Terminal Reed Switch type, Professional Quality. : Amazon.co.uk: DIY & Tools
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