... convenience,safe,gift 3.7 hours warming,durable Name:New Art of MIMI Hand WarmerFeatures:1.USB head charger,high applicant,public ... treasure the most popular in society today, most convenient way of keeping warm and durable, size is only 85mm * 60mm * ... working conditions, arbitrary set appropriate temperature. Warranty:the electronic part of this product was guaranteed for one year which under nornal ...