Winter Men's Smart USB Abdominal Back Electric Heating Warm Down Cotton Vest Please check the Size Chart before order. If you are not sure the size, please send message to us. Features:1.This is a intelligence coat for you. 2.Covering the cold area. 3.Built-in portable source storge pocket, easy travel. 4.Set the temperature you want to respond to a variety of environments. 5.A button to heating, three stall temperature control, intelligent heating. 6.The fashion is warm, comfortable and breathable, and its a good partner for your winter going out. 7.General USB interface power supply, longer service life, water splashing and washable. Product information:Season:Autumn, WinterGender:MenOccasion:Daily,CasualMaterial:PolyesterStyle:CasualSleeve length:NonePower Supply Interface: USB Power Supply: 5V/2A Portable Source(Not Included) Fever Area: BackHand Function: Keep warm, water splashing and cold Temperature Shift(Manual adjustment) Warm:45 (Red Light) Comfort:35 (White Light) Energy Saving:25 (Blue Light) How To Use: 1.Take out USB plug 2.Plug in removable charger 3. on the removable charger 4.Press the chest temperature control for two second 5.Red light flashing,means heating automatic 6. 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 for two second,lights out and stop heating Washing instructions: 1.Take out removable charger. 2. detergent is available and then hand wash. 3.Do not knead or beat. 4. nature drying can be use. Note: 1.If not used for a long time,please do not plug in removable charger 2.Do not use high temperature water or strong detergent. 3. 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. Package Included: 1 x Loose Vest (Portable Source Not Included)Size US Size UK Size EU Size Bust Shoulder Length L 8 12 38 110cm/43.31'' 41.5cm/16.34'' 67cm/26.38''Size:L US Size:8 UK Size:12 EU Size:38 Bust:110cm/43.31'' Shoulder:41.5cm/16.34'' Length:67cm/26.38''