... New Art of MIMI Hand Warmer 1.USB charger,lithium battery, 2.portable,convenience,safe,gift 3.7 hours warming,durable Name:New ... Art of MIMI Hand WarmerFeatures:1.USB head charger ... set appropriate temperature.Warranty:the electronic part of this product was guaranteed for one year ... without any hesitate.ALL KINDS OF HAND WARMER Special New Art of MIMI Hand Warmer