NOVELTY - The system comprises a thermal management device component and a computing device component. The thermal management device component comprises a heating and/or cooling element made of composition including graphene sheets. The thermal management device component includes a heater. The compositions comprise coatings. The graphene sheets have a surface area of 300 m2/g. The computing device component comprises personal computers, smart phones, and tablet computers. The graphene sheets have a carbon to oxygen molar ratio of 25:1.    USE - The system including a thermal management device is useful for heating or cooling a part of a body for medical treatment, therapy, rehabilitation, comfort, thermal conditioning and bio-feedback applications, and in items such as apparel, bags, gear, etc. Examples include shirts, jackets, coats, vests, shirts, pants, shorts, hats, helmets, shoes, boots, belts, gloves and mittens, socks, underwear, sweat shirts and pants, athletic apparel and gear, hand bags, purses, backpacks, briefcases, messenger bags, computer bags, satchels, luggage, sports bags e.g. golf bags and gym bags, tents, sleeping bags, sleeping pads and mattresses, hunting and sports equipment, ski apparel such as ski jackets, pants and boots, chairs, cushions, upholstered objects, seats such as car or vehicle seats, ballistic protection equipment e.g. bullet-proof vests and scuba diving equipment, and as pocket warmers, where the part includes joints, muscles, extremities, head, abdomen and skin.    DETAILED DESCRIPTION - The system comprises a thermal management device component and a computing device component. The thermal management device component comprises a heating and/or cooling element made of composition including graphene sheets. The thermal management device component includes a heater. The compositions comprise coatings. The graphene sheets have a surface area of 300 m2/g. The computing device component comprises personal computers, smart phones, and tablet computers. The graphene sheets have a carbon to oxygen molar ratio of 25:1. The composition further comprises polymeric binder, and is present in the form of an ink or a coating. The thermal management device component further comprises an electrically conductive component that comprises the sheets and a medical or therapeutic device, and is located into an article of apparel. An INDEPENDENT CLAIM is included for a method of controlling a thermal management device.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a thermal management device.    Thermal management device (50)    Laptop computer (52)    Connector (54)    Display screen. (56)