... because of portability. Usage: Find the small liquid pack inside and break it,this item will get cold ... or hot within 3 seconds. Then shake it up and down to make the content fully mixed, ... zero in 2 minutes, and the instant hot pack will be approximately 55 in 2 minutes.Purpose: ... , headache, toothache, mosquito bite rapidly. The instant cold pack can keep the vegetable, fruit, beer, beverage or food ...