To activate: Locate metal disc and bend with fingers until it clicks After a few seconds, knead gel for optimum performance To recharge: Put the cooled pack in boiling water. Boil for approx. 5 minutes or until crystals are liquefied and clear Allow to cool before re-activating Keep away from the heated surface of pan Do not put the hand warmer in a microwave oven Contents: sodium acetate, water ( non-toxic)