Idk what I said to help but you're welcome! Lol
I must have not been looking close enough to what message was prior. Doofy posted the brand he uses. I am ordering 2 today for the 2 freezers and 2 refridgerators. Manual indicates easy enough to set up.
https://www.acurite.com/media/manuals/00986-instructions.pdf
I would definitely use Lithium batteries in the sensors that go in the freezers. They are AA. Normal alkaline batteries do fine though.
There are cheaper freezer alarms but I've always been impressed with Acu-Rite products. I have their Weather Stations.