Description:  Temperature (Manual adjustment Built-in hidden switch).  Warm: 50 Degrees (Red Light).  Comfort: 40 Degrees (White Light).  Energy Saving: 30 Degrees (Blue Light).  Mens Intelligent Heating USB Sleeveless Vest Full Zipper.     Note:  This clothes belongs to slim style, please judge the appropriate size according to the size chart before buying.  If you like more loose, please increase one or two yards to buy, please know it before your buying.     Specification:  Material: Polyester;  Color: Black/Black Camouflage;  Size: XL/2XL/3XL/4XL;  Power Supply Interface: USB;  Power Supply: 5V/2A Mobile Power (Not Included); ; Fever Area: Back + Collar;  Function: Keep warm, Anti water splashing and Prevent cold;  Age Of Application: Adult Men.     Features:  This is a intelligence vest for you.  With mobile power storge pocket, easy travel.  3 seconds 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.     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 two 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.     Note:  1.Manual measuring, please allow 1 ~ 3 cm error,thank you.  2.Please leave us a message about your prefer size and color,or we will send by random.  3.Due to the difference between different monitors, the picture may not reflect the actual color of the item.  We guarantee the style is the same as shown in the pictures.Please understand, thank you      Package Included:  1 X Sleeveless Vest (Mobile Power Not Included).