Product review (2 stars): PRETTY MUCH USELESS
So the main reason for buying this was to let me know WITHOUT OPENING THE DOOR how cold the deep freezer is.
Turns out my brand new Frigidaire has some special sucker seal on it.  When I close the door, it starts to actually suck the air out of the gasket seal, trying to suck the door shut very tight, to provide for an airtight seal.

So guess what?  if this thing's wire is coming from the outside, across the rubber gasket in the door, so the probe is inside the freezer, it makes a small gap in the seal.  After a week, I came down, opened the door, and there is like 3 inches of frost all around the probe wire, and the probe, the gasket, the door, etc.  where the wire enters across the gasket.  So there is no way your gasket is going to seal perfectly around this wire.

If they had a wireless one, I might go for it.

Right now, this thing is sitting on the outside of the freezer door.  If I have a power failure, I might use it, just so I can see the interior temperature without constantly opening the door.