The hot pack gives instant heat up to approximate 54?

when activated, and can be reused more than a hundred times by following the instructions, it could be used outdoor for physiotherapy, it works especially effective on muscle aching,back aching, cramps,arthritis pain,tenontodynia and etc. To recharge:

Place the hot pack in boiling water with cloth below( Note: prevent the bag from contacting the bottom of the pot ) for about 5 minutes or until all the crystal is dissolved.

To activate:
Place the metal inside between forefinger and thumb, press against is to start crystallization, when the crystallization completed, squeeze the hot pack to make it soft and ready to use.
Hot use physiotherapy:
Turn the protruding button downwards, rub it until it becomes soft, this hot pack gives soothing effect to rheumatic conditions of joints as well as pain caused by abdomen,stomach,waist,leg,shoulder,neck & nerves.

It also stabilizes the body temperature in winter.