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A Certified Refurbished Ring Alarm Contact Sensor is refurbished, tested, and certified to look and work like new and comes with the same limited warranty as a new device.
Get instant mobile alerts when doors and windows open in your home
Now smaller to enable increased placement options
Easy installation with no tools required
Mounts to door and window frames
Includes two 3V CR2032 batteries
Requires the Ring Alarm Base Station