I received this for Christmas. It came with a manual, but the manual mentions not one word about how the “preheat” feature on the controller works, nor whether using preheat is part of the 10 hours of usage before the blanket automatically turns itself off ( as an energy conservation feature). Sunbeam... The preheat feature needs to be added to your manual so customers will know how to use it properly. I would also like to add that the number on the controller is so dim that I can barely read it, even in darkness.
My manual is 2020 Sunbeam Products, Inc.  P.N. 201151 Rev A