How do heat pad work?
the ones where you click rather metal disc that heat crystals or something close to that
Answer:
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Boil the pouch until the contents are completely liquified. When ready to use, click the disk. This will start a crystallization process that give off boil. Re-boil to liquify and store the pad.
They offer off a suitable amount of heat for a while, but if you want something steady and long stable, get an electric one (assuming you'll be close electricity when you need it). One nouns they excel in is providing impermanent heat to the body when it's cold out. They even engender little ones that will fit inside mittens/gloves.
See link below for explanation and more info.
they enjoy never helped me