Doumern heated jacket(coat,parka) adopts the latest graphene technology. Compared with other heating pad of the same area, the heating area of ??the heating pad is increased by 2-8 times. our's heating elements is whole piece heating, and the heat distribution is more even. The effect can be seen very clearly on the thermal imager. With a 18400 mAh large-capacity power bank, it can be used for up to 10 hours when fully charged. Whether you are afraid of cold, or like outdoor camping, or work in cold outdoor environments, Doumern heated jacket is your best choice and an excellent gift for your family and friends.