Description:  Temperature Shift (Manual adjustment).  Warm: 50degree Celsius (Red Light).  Comfort: 40degree Celsius (White Light).  Energy Saving: 30degree Celsius (Blue Light).     Specification:  Name: XL/2XL/3XL/4XL Thermostatic Heating USB Intelligent Heating Sleeveless Vest;  Fabric Name: Polyester;  Fabric composition: spandex;  Color: camouflage gray;  Size: XL/2XL/3XL/4XL;  Voltage: 5V;  Rated power: 9W;  Rated current: 1850mA.     Features:  Infrared fever, neck, back heating.  Imported carbon fiber yarn, safe, no radiation, heat and temperature, long service life.  One button heating, three-speed temperature control, there will be light changes.  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.  After unplugging the power supply, it can be washed and machine washed.  Light and close.  The heating process is a hot compress for the joint points of the human body.     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.     Application:  Unisex, outdoor, everyday leisure.     Package Included:  1 X Heating vest.