Features:This is a intelligence vest for you.With mobile power storge pocket, easy travel.1 minutes fast heat, dispel cold and keep you warm.Set the temperature you want to respond to a variety of environments.A button to heating, three stall temperature control, intelligent heating.It can be washed by machine and can be washed by hand. Do not wring it by hand.General USB interface power supply, longer service life,anti water splashing and washable.The fashion is warm, comfortable and breathable, and it's a good partner for your winter going out.Specifications:Style: Sleeveless VestMaterial: PolyesterColor: BlackUK SIZE: XS/S/M/L/XL/2XLPower Supply Interface: USBPower Supply: 5V/2A Mobile PowerNot IncludedFever Area: Back / BlueFunction: 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.After red light flashes for 5 minutes,then automatic turn to white light,means medium temperature7.Manual adjustment has three level,red light means hign-temperature heating continuously.White light means medium heating continuously,blue light means low heating continuously8.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:1X Sleeveless Vest (Mobile Power Not Included)1X USB CableNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering.3. The vest need to connect with power bank to heating, power bank is not included.4. Do not use inferior power bank to supply power, otherwise there will be no power supply.