Feature 1.1 Minute fast heat, dispelling cold and keeping you warm. 2.Set the temperature you want to respond to a variety of environments. 3.A button to heating, three stall temperature control, intelligent heating. 4.It can be washed by machine and can be washed by hand. Do not wring it by hand. 5.General USB interface power supply, longer service life, anti water splashing and washable. 6.The fashion is warm, comfortable and breathable, and it's a good partner for your winter going out. Specification: 1.Style: Sleeveless Vest 2.Material: Polyester 3.Color: black 4.Size: S/M/L/XL 5.Power Supply: 5V/2A Mobile Power(Not Included) 6.Temperature Shift(Manual adjustment) 7.Warm:56 (Red Light) 8.Comfort:46 (White Light) 9.Energy Saving:39 (Blue Light) Package Contents: 1 * Heating Vest(Mobile Power Not Included)