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