How do re-usable hand warmers work ?

I have just gotten one of those handwarmers from home bargains but I dont know how to make it go warm again.
I put it in boiling water but I dont know how to make it warm when I click the button/switch thing 🙁 Do yuu

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One Response to “How do re-usable hand warmers work ?”

  1. John T says:

    let make this clear
    I DONT KNOW.lo0l

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