Counting sheep and cold at night? The comfortable soothing warm Serta Low Voltage Sherpa Mattress Pad combines heated technology and superior protection all in one design. This soft mattress pad features the cozy plush polyester Sherpa top that provides an added layer of comfort and support while you sleep. This Serta Sherpa mattress pad features the unique Safe and Warm Technology that provides the ultimate comfort with ultra-fine wires that are virtually undetectable. Say goodbye to sleeping on bulky wires and uneven heating found in most heated mattress pads and begin to soothe your body while you sleep. The Serta low voltage technology is safe and converts 120 volt AC current to less than 25 volts of DC current. That means you can snuggle in without stressing. This mattress pad is safe in the presence of moisture, will not harm pets and emits no EMFs. The patented low voltage technology is the only electric technology that is certified as non-hazardous. The easy-to-use controller allows you to find the heat setting that is right for you, with 11 heat settings per controller. Queen, King and California King sizes provide dual warming zones, each with its own controller, allowing everyone to sleep comfortably at their ideal temperature. Plush comfortable cozy sherpa, barely-there skinny wires, and safe low-voltage technology mean you will be sleeping in total soothing support (without the sheep) but with the world's safest electric mattress pad. Safety Features include 10-hour auto shut-off and over heat protection. Fits up to 18 in. deep mattresses.