Description Our Size Chart show base on Asia size Asia size L EU size M US size SPlease Choose Size base on weight and height Base on our size chart it is Correct Specifications Style Long Sleeve Cotton CoatTemperature Shift Manual adjustment Warm 45 ℃ Red Light Comfort 35 ℃ White Light Energy Saving 25 ℃ Blue Light Material PolyesterColor Black BlueHeating Area Back and NeckSize L XL 2XL 3XL 4XLPower Supply Interface USBFunction Keep warm Anti water splashing and Prevent coldAttention Please kindly note that the power bank is not included in this item You need bring by your own Please use 5V 2A power bank less than 20 000 mAh USB interface Features 1 1 minutes fast heat dispel cold and keep you warm 2 With mobile power storage pocket easy travel 3 Set the temperature you want to respond to a variety of environments 4 A button to heating three stall temperature control intelligent heating 5 Fabric 20D nylon plus waterproof treatment 6 General USB interface power supply longer service life anti water splashing and washable 7 The fashion is warm comfortable and breathable and its a good partner for your winter going out How To Use 1 Take out USB plug 2 Plug in removable charger Not Included 3 Switch on the removable charger 4 Press the chest temperature control switch for 3 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