This is a Johnson Controls thermostat that will allow you to make a freezer into a refrigerator OR make a beer KEG refrigerator. You just max out the thermostat on your fridge or freezer, plug the appliance cord into the Johnson Controls unit, and plug the Johnson Controls unit into the wall. Insert the probe into the freezer or fridge you want to control. Then set the Johnson Controls thermostat (dial) and you are good to go.
I bought this to turn a freezer into a refrigerator for living off the grid as a freezer turned into a fridge is much more energy efficient. But that's just one possible use.
Don't bother with the stupid scams, not sending a code, not shipping, not dealing with nigerians, etc. No checks. Cash in person.