This heating bag hand warmer is made of graphene carbon fiber and flannel, and the graphene carbon fiber inside can heat quickly, which can warm hands and relieve sore hands. With 3 temperature adjustments, easy to operate, and is perfect for cold winters, everyday use, and when relaxing on the sofa, bed, or desk. Features - ColorGrey - Outer layer material: Flannel - Inner material: Graphene carbon fiber - Size: About 26.00X16.70X2.00cm/10.22X6.56X0.79in - : USB - Rated power: 5 W - Rated voltage: 5 V - Power supply: 5V/1A - Temperatures levels: 55 degree centigrade, 45 degree centigrade, 40 degree centigrade - Rapid heating system: The graphene carbon fiber inside can heat quickly, and can also warm hands in winter. - Hands comfortable: Combines the efficacy of a vacuum flask and a heating pad to keep hands warm and relieve fatigue hands. - Temperature adjustment: The electric heating bag has 3 kinds of temperatures to adjust, easy to operate. - USB charging: USB socket design, easy to charge, connect to a power bank, or any power product with a USB port. - Multiple occasions: Perfect for cold winters, everyday use, and when relaxing on the sofa, bed, or desk. Package list: 1 x Electric Heating Bag