I want to know when a room gets too hot or cold

You can configure cameras to notify your mobile device when the temperature of a room goes above or below the specified temperatures.
Supported devices
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Shelf camera (KX-HNC810, KX-HNC815)
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Floor camera (KX-HNC850, KX-HNC855)
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HD Camera (KX-HNC800, KX-HNC805, KX-HN1003)
Required procedures
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Use the [HomeHawk] app to configure the camera’s sound alert feature.
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Floor cameras: See Notification settings.
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Shelf cameras: See Notification settings.
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HD Camera: See [Notification Settings].