I bought this mattress pad when I bought my Sleep Number bed at a Select Confort Storefront. I was use to a water bed with a heater, so when I went to the Sleep Number bed, I wanted it to be toasty warm. I have had continual problems with this item. I have had conversations with their designer, regional sales manager, electrical engenieer, and many customer service. When it was turned on, It constantly scrambled my tvs and radios, and everyone elses in this subdivision. They have had to keep improving the designs, so that they wouldn't cause interference. ( It became a mini radio station) . ...read full review »