... 3.The highest temp:45.C 4.Heating foot pad Heating foot pad With SGS, FDA, and ISO 2009 certification The biggest ... , no microwave radiation, non-poisonous, non-flammable, harmless and environmental.Note:Disposable, needs no refrigeration. Start to react once open bag ... sunlight. OEM service:According to your different reqirement,the warmer pad may have different size,shape,and heating duration time.