... no need power 4. cool effect fashion design notebook cooling pad Material :inside:gel outside: PVC+nylon taffeta Size :300mm*200mm ... PackagingDelivery 2 ~ 5 weeksCertification CE, ISO13485 , FDA , MSDSCooling pad for body:cooling pad lowers the temperature through physical cooling, can be applied ... and when the smoothie become to be liquid, put the mat in the place below 27 centi degree. And the liquid ...