Our Patent-Pending Cooling Bed is the only one that doesn’t need water or electricity. The cooling pad is weight or pressure activated. As soon as your pet lies down, the cooling effect starts. And it lasts for up to four hours (depending upon conditions)! You can put it in the refrigerator to super cool it and it will be cooler & last longer. The pad recharges automatically after a short period of non-use. You can supercool your pad by putting it in the refrigerator or freezer and it will last up to 6 hours.