... safe,gift 3.7 hours warming,durable Name:New Heater of MIMI Hand WarmerFeatures:1.USB head charger, ... working conditions, arbitrary set appropriate temperature. Warranty:the electronic part of this product was guaranteed for one year ... specialized in small home appliances,electronic censers,milk-heater,hair -straighter,digital ceramic,electronic hot keltle,heater and handwarmer,if interested,please ...