I'll answer my own question (in picture) as I just recently got the WH55.
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On high sensitivity, my damp hands will set it off.
I'm unable to make more than one email notification for this sensor. For example, you can set the notification for offline, normal or leaking. I can only make the notification for one of those. If would be nice to get an email notification for the sensor detecting leaks and when its offline. When I try to create the second notification, it just supercedes the first notification. Anyone else experience this?