Features: This is a intelligence vest for you. With mobile power storge pocket, easy travel. 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: Style: Sleeveless Vest Material: Polyester Color: Black UK SIZE: XS/S/M/L/XL/2XL Power Supply Interface: USB Power Supply: 5V/2A Mobile PowerNot Included Fever Area: Back / Blue Function: Keep warm, Anti water splashing and Prevent cold Age Of Application: Adult Men Temperature ShiftManual adjustment Warm:45 (Red Light) Comfort:35 (White Light) Energy Saving:25 (Blue Light) 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. Package Included: 1X Sleeveless Vest (Mobile Power Not Included) 1X USB Cable Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering. 3. The vest need to connect with power bank to heating, power bank is not included. 4. Do not use inferior power bank to supply power, otherwise there will be no power supply.