This product is functional jacket combine surface heating element (Korea Patent : 0337609) with portable rechargeable battery unit and make heat about 60o C ~ 70o C (140o F ~ 158o F) for long hours. This is for outdoor workers, outdoor sports, and old people to overcome cold weather. Won Q mark from Korea Electric Testing Institute (KETI) and no electromagnetic waves. 300 to 500 cycle rechargeable battery included
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