Product review (5 stars): easy to install.  take a picture w phone,  cut it out, and reinstall just like it came out.
very simple to install.  always recommended when replacing defrost heater . Unplug fridge, remove shelves and panel  from rear of freezer .  Ice maker may have to come out too. Locate This thermostat usually at top of evap coils. cut out old one with wire cutters and strip wire.  Crip on but connectors should not be useed unless you have good crimping pliers and use heat shrink tubing or 2 layers of electrical tape. Most professionals use wire nuts and then electrical tape.  Pro tip:  Point wire nuts up so that water and ice cant get into wire nut and actually unplug the wires as the ice thaws and refreezes over the years