Bought the CDN Audio Visual Freezer Alarm for our backup freezer. When we had an addition added on to the back of our home, the electrical part must not have been done up to code because every now and then we trip a breaker. I think it is when we run the air conditioner in the additional room AND use the treadmill. Problem is, the outlets that it trips also run the standup freezer where all our backup frozen meat is store.
The other day, it tripped and Wifey figured it out about 24 hours later. Let's just say there was some blood running down the inside of the freezer door thanks to the thawing. I have had the freezer alarm on my Amazon Want List for a while as a redundancy check. After this incident, and the fact that it was only $8, I went ahead and purchased it.
It is a very simple mechanism. Powered by two AA batteries. You simply stick it near the hinge side of the door on the outside and run a cable sensor inside the freezer. Give the gizmo 20 minutes to get used to the new temperature and then turn it on. It will let out a shrill alarm sound when the inside sensor raises in temperature.
Peace of mind for $8. Gotta love that!