Product review (1 stars): Far worse than I ever anticipated!
Paired the device with the app yesterday.  Where the app should have shown the humidity and the temperature, it displays N/A and N/A.  This morning I put in a brand new battery, unpaired the device from the app and tried to re-pair.  Couldn't do it!  Hopefully I can return this overpriced toy for a full refund.  UPDATE several hours later:  I just tried setting it up again, and it worked as advertised.  I did nothing differently from what I did earlier.