These work well and are set up to notify me whenever the doors have been opened or closed. The only issue that I have is that they show up as offline when paired with my SmartThings hub. They still work and send notifications but it is a bit of an annoyance that they are "offline". The only other issue is that they are not compatible with certain home automation apps such as the Alexa App, unlike the motion sensors, which is disappointing since I would have liked them to have allowed me to announce via Alexa that the door has been opened or closed.

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Inexpensive and works, but they constantly show as "offline" on my Samsung Smartthings Hub v3, even though they're still working and show real-time status. Not sure if it's the sensor or my hub that's acting up. I have multiples of these sensors and they show the same "offline" status.

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Haven't had a chance to install yet, but seems nice