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Ring Alarm Outdoor Contact Sensor (2-pack) Alerts you when a door or window is opened at Crutchfield
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How to Install your Ring Alarm Contact Sensors on Different Types of Doors, Windows, and Trim – Ring Help
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Amazon.com: Sensor Riser Compatible with Ring - Security Sensor Spacer for Wireless Home Security System, Self Adhesive DIY Ring Alarm Spacer for Door Window Home Security System Accessories, Pack of Two :
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