Description:  1 minutes fast heat, dispel cold and keep you warm.  Set the temperature you want to respond to a variety of environments.  A button to heating, three stall temperature control, intelligent heating.  It can be washed by machine and can be washed by hand. Do not wring it by hand.  General USB interface power supply, longer service life,anti water splashing and washable.  The fashion is warm, comfortable and breathable, and it's a good partner for your winter going out.     Specifications:  Material: Carbon fiber;  Color: Black, Red;  Size: S/M/L/XL/2XL/3XL/4XL;  Power Supply Interface: USB;  Power Supply: 5V/2A Mobile Power (Not Included);  Function: Keep warm, Anti water splashing and Prevent cold;  Age Of Application: Adults.     Temperature Shift (Manual adjustment):  High Temperature: 45degree Celsius;  Middle Temperature: 35degree Celsius;  Low Temperature: 25degree Celsius.     How To Use:  1. Plug the USB plug into the socket of the charging treasure, and the battery indicator light is on. (If the vest switch is not turned on after one minute, the charging treasure will be turned off.) At this time, you need to press the charging treasure switch to turn on the charging treasure, and the indicator light is on.  2. When the charging treasure indicator is on, press and hold the button 2s to open the button switch, the vest is hot, and short press to switch the gear position.  The charging treasure can be placed in the inner pocket, and the outside is not visible.     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 Sleeveless Vest (Mobile Power Not Included).