Hi! Welcom to duckduck's store,We provide fashion products in best quality and reasonable price,CLICK THE LINK "Visit Store" to buy more products you need. Enjoy shopping! Material: Polyester Color: Black/Red/Blue Size: XS/S/M/L/XL/XXL/XXXL/XXXXL Power Supply Interface: USB Power Supply: 5V/2A Portable Source（Not Included） Fever Area: Back + Neck Function: Keep warm, Anti water splashing and Prevent cold Age Of Application: Adults Unisex Temperature Shift（Manual adjustment） Warm:45-55°C (Red Light) Comfort:35°-45°C (White Light) Energy Saving:25-35°C (Blue Light) Features: This is a intelligence coat for you. Built-in portable source storage pocket, easy travel. Back & neck zone fever, covering the cold area. Set the temperature you want to respond to a variety of environments. A button to heating, three stall temperature control, intelligent heating. The fashion is warm, comfortable and breathable, and it's a good partner for your winter going out. General USB interface power supply, longer service life, anti water splashing and washable. 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 three 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 three second,lights out and stop heating 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. 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 the cloth is wet. 4.Use time depending on the capacity of removable charge. Package Included: 1 x Coat(Portable Source Not Included) More surprise,please visit our store! Wish you a great day!