Product review (3 stars): Alarms if freezer gets too cold?  Why?!
Product largely delivers on its promises.  However, a couple points render it almost ineffective.

The suction cup will not work in freezing temperatures, and quickly loses its grip.  And most annoyingly, the freezer alarm will sound if the freezer gets "too" cold!

I had planned on using the device to sound an alarm if the chest freezer in my garage failed.  But the alarm keeps sounding, telling me that my freezer is too cold!!!  I happen to be glad that my freezer is at or below zero.  I wanted an alarm that would tell me if the freezer failed.  Not that my freezer was too cold.  Ridiculous.