keep Your Body And Hands Warm: Qualified Carbon Fiber Heating Elements With 3 Heating Levels To Generate Consistent Heat For 4 Core Body Parts, Including Your Neck, Back, Abdomen, And Waist, Helping To Maintain Body Warmth. Long-lasting Usage: A 10000mah Power Bank Offers Up To 8 To 10 Hours Of Warmth On Average(lasting Period Can Be Vary Depending On Different Types Of Power Bank); Power Bank Is Not Included In Our Product. Overheat Protection: Implanted Sensor Will Be Triggered To Terminate Heating Immediately If, for Any Reasons, The Heating Areas Internal Temperature Exceeds 150f. Guarantee Your Safety In Any Occasions. Due to different measurement methods, please allow a measurement error of 2-3cm. Due to the problem of shooting tools and light, please allow the color difference between the picture and the product.