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There's a little extra feature in the contact sensors you may not know about. It helps them be even more secure, watch the video to find out...
Be sure to check out the full review here:
• Ring Alarm (without se...
Door Contact sensors (As an Amazon Associate I earn from qualifying purchases):
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Or I can tell you down here that there's a switch inside that will detect if someone opens the sensor. It alerts you on your phone that the tamper sensor has been triggered.