Serta Ultra Plush Low-Voltage Electric Heated Micro-Fleece King Blanket, Charcoal 100% Polyester Made in the USA and Imported 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 blankets are almost impossible to feel; no hot or cold spots Convenient temperature pre-heat and hold feature that makes sure that your bed is warm and cozy before you climb in for the night; built in over-temperature protection for safety and peace of mind Blanket 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-fleece fabric that is completely machine washable and dryable without any pilling, shrinking or stretching