Description: Temperature Shift (Manual adjustment); Warm: 45/50 degree Celsius (Red Light); Comfort: 35/40 degree Celsius (White Light); Energy Saving: 25/30 degree Celsius (Blue Light); L/XL/2XL/3XL/4XL Thermostatic Heating USB Intelligent Heating Sleeveless Vest.Specification: Fabric Name: Polyester; Fabric composition: spandex; Color: black; Size: L/XL/2XL/3XL/4XL; Voltage: 5V 2A; Operating temperature range: about -5 degree Celsius -40 degree Celsius; Waterproof Rating: 3.Features: One button heating, three temperature control, intelligent heating. Infrared heating, no radiation, built-in heating module, intelligent heating. Waterproof process design, safe. Humanized heating part design. Long-lasting fever, long battery life, 10000mah≈8hours. Machine washable, hand washable. Anti-drilling process, energy-saving design. Light and close.Application: Unisex, outdoor, everyday leisure.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 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 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.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 cloth is wet. 4.Use time depending on the capacity of removable charge.Package Included: 1 X Heating vest.