Style: Sleeveless VestMaterial: 100% Polyester fiberPower Supply Interface: USBPower Supply: 5V/2A Mobile PowerNot IncludedFever Area: BackFunction: Keep warm, Anti water splashing and Prevent coldAge Of Application: Adult MenTemperature ShiftManual adjustmentWarm:45 (Red Light)Comfort:35 (White Light)Energy Saving:25 (Blue Light)How To Use:1.Take out USB plug2.Plug in removable charger3.Switch on the removable charger4.Press the chest temperature control switch for two second5.Red light flashing,means heating automatic6.Manual adjustment has three level,red light means hign-temperature heating continuously,White light means medium heating continuously,blue light means low heating continuously7.Press the chest temperature control switch for two second,lights out and stop heatingWashing instructions:1.Take out removable charger.2.Neutral detergent is available and then hand wash.3.Do not force knead or beat.4.After nature air drying can be use.Package Included:1* Sleeveless Vest (Power Bank Not Included)