Here are some suggestions for removing the device:
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The device needs to be removed from any SmartApps that may be using it.
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When you remove it through the mobile app you should press the button on the siren to complete the exclusion.
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If you moved the device after pairing it, it might be too far away from the hub so you should try moving it closer.
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If all else fails, delete it from the IDE and perform a factory reset on the device by holding down the button for about 20 seconds.
Other users with similar problems have had better luck with the device handler below.