It adopts the principle of infrared heating, rapid heating, three-speed temperature adjustment, not afraid of cold winter.FEATURESIntelligent Heating: Heats up in 3 seconds with an efficient graphene carbon fiber heating system. Intelligent heating settings (35C-45C-55C/95F-113F-131F) to suit your needs.Comfortable Material: Breathable and ultra-light material. Comfortable and soft cotton with decent elasticity.Health Benefits: Graphene heating technology and release of 8-9mm far-infrared rays aid blood circulation and help relax tense neck muscles. The position of the heated pad can be adjusted for targeted therapy.Human-friendly: The output current is 5V, which is a weak current within the acceptable range of the human body and will not cause harm to the body.Long Battery Life: 4800mAh power bank, battery life up to 7 hours. Washable (hand wash and machine wash) (Note: Please be sure to remove the mobile power before washing.)SPECIFICATIONSMaterial: CottonCurrent: 5VColor: red; pink; gray; blue; navy blue; blackWeight: 110g / 0.24lbSize: 80*10cm / 31.49*3.93inPACKAGE INCLUDED1 Upgraded Heating Scarf (without Power Bank)