Evenly spaced heating elements deliver even heat distribution throughout. UL certified and engineered to emit VIRTUALLY NO EMF radiation. Your safety is of utmost importance to us..Queen and larger sizes come with dual zone temperature capability and 2 controllers to conveniently adjust temperature independently with cotton, soft and breathable cover for added comfort..Features 20 Heat settings and compatible with smart home outlets and automatic timers. A PRE-HEAT feature can jump start the warming process and the auto shut off can be set from 1-10 hours..1 Heated Mattress Pad: 39"W x 75"L + 18"D with all elastic to fit 21" thick mattress; controller cord 12ft, power cord is 6ft; DO NOT LEAVE CONTROLLER COVERED WHEN IN USED TO AVOID OVERHEATING..Designed with your safety in mind, it is UL certified and independently tested to provide the highest safety standard. Conveniently machine washable and backed by a 5 year warranty.