Product review (4 stars): Learn from my mistake, protect your food.
I purchased two of these to use for my 7cf freezer all you do is place the probe inside the freezer and leave the unit sit on top. The unit beeps when the freezer temperature drops below 15F. The only suggestion I would have for the manufacture is to make the beep a little bit louder. The beep continues for about five seconds then pauses for about 30 seconds this appears to continue until the freezer reaches the proper temperature.