Product review (1 stars): the best setting found was a minimum of 29F with a ...
There is a black uncalibrated knob in the back that is supposed to be used to adjust temperature.  The default setting caused all refrig contents to freeze and here is no way to know temperature.  So I bought a refrigerator and a freezer digital wireless thermometer which also display minimum and maximum temperatures.  After several days of adjusting, the best setting found was a minimum of 29F with a maximum of 40F, all without opening the refrig door. This huge swing is totally unacceptable.  I don't recommend this product to anyone.