Serta Luxurious Plush Top Low-Voltage Electric Heated King Mattress Pad, White Safe and warm patented non-hazardous low voltage technology is safer than others on the market; saves energy; sleep better in a cooler room No more bulky wires; the ultra-thin wires inside the Serta pads are almost impossible to feel; no hot or cold spots Convenient automatic temperature pre-heat and hold feature for cozy warm sheets; built in over-temperature protection for safety and peace of mind Pad is divided into two separate zones and includes dual controls for individual adjustment and comfort; automatically shuts off after 10-hour for convenience, safety and savings Luxurious incredibly soft micro-plush fabric that is completely machine washable and dryable without any spilling, shrinking or stretching