The Serta Waterproof Heated Mattress Pad provides added comfort and protection to the top of your mattress. This soft heated mattress pad features a waterproof top fabric that helps preserve the quality and comfort of your mattress. A controller with 10 heat settings provides the perfect amount of warmth, while the 1-12 hour automatic shut-off timer helps ensure your safety. Machine washable for easy care, this waterproof heated mattress pad brings cozy comfort to your bed. Twin and Full size have one controller, Queen and King size have 2 controllers. The product includes manufacturer’s 5-year warranty.