This is a wonderful mattress pad/bed warmer. I have a king bed and each side has its own controls. I just turn on my side 10-15 minutes before going to bed and the bed is perfect crawling under the covers. I like to keep my room cold but love to crawl into warm covers. I usually have to turn my side off in the middle of the night, or down to 1 or 2, because I don't like to be too warm. My husband keeps his on all night between 6 and 8. Great purchase.