Iris Iris Indoor Door And Window Sensor Only $9.99 at Lowe’s (Regularly $25)
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This sensor can be used on doors, windows, cabinets, safes or anywhere that you want to be alerted that is opened or closed. Plus, the sensor reports the temperature to the Iris app and works with Google Assistant.
Note that The Iris Smart Hub is required to connect the contact sensor with the Iris app.