Click Heat Packs/ Gel Heat Packs for Body Compress 1) CE,MSDS,FDA,ISO13485 and ISO9001 approved; 2) different designs. Instant Heat Pack/ Magic Heat Pack/ Magic Heat Pad/ Magic Hot Pack 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)