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. How To Use: 1.Take out USB plug 2.Plug in removable charger 3.Switch on the removable charger 4.Press the chest temperature control switch for two second 5.Red light flashing,means heating automatic 6.After red light flashes for 5 minutes,then automatic turn to white light,means medium temperature 7.Manual adjustment has three level,red light means hign-temperature heating continuously. White light means medium heating continuously,blue light means low heating continuously 8.Press the chest temperature control switch for two second,lights out and stop heating Temperature Shift(Manual adjustment) Warm:45 ℃ (Red Light) Comfort:35 ℃ (White Light) Energy Saving:25 ℃ (Blue Light) Washing 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. Specifications: Style: Sleeveless Vest Material: Polyester Color: Black Size: S/M/L/XL/2XL/3XL Power Supply Interface: USB Power Supply: 5V/2A Mobile Power(Not Included) Fever Area: Back Function: Keep warm, Anti water splashing and Prevent cold Age Of Application: Adult Men Package Included: 1X Sleeveless Vest(Mobile Power Not Included) Warm Tips: 1.If not used for a long time,please do not plug in removable charger 2.Do not use high temperature water or strong acid detergent. 3.Forbidden to use electricity for wet clothes,Please turn off the power and stop using if cloth is wet. 4.Use time depending on the capacity of removable charge. 5.Manual measuring, please allow 1 ~ 3 cm error,thank you.