Heat in the microwave (5-7 mins) for a long-lasting, durable heating pad you slip under or inside your pet's bedding. Just one microwave session provides safe and gentle heat for up to 12 hrs. Great for newborns, elderly, and arthritic birds or other "pets". Comes with single cover which is fitted with Velcro fasteners to hold the Snuggle Safe™ Heating Pad. 9" Diameter.