PRODUCT DESIGN CONCEPTHeated vest wearing effect is more fit close to keep warmer wear as inner wear.One heated vest can replace multiple heavy clothes.light and thin heating vest make winter sports enthusiasts warm in winter.POWER BATTERY NOT INCLUDEThe upgraded double-sided USB cable is suitable for all mobile power sources. Buyer can rest assured to use your own powerbank for heated vest.10 HEATING PANELS & 3 HEATING SETTINGSthe heating plate is made of nano-composite fiber, which has strong heat preservation, fast heat generation, high temperature and long life. The red light is 45C, the green light is 35C, and the blue light is 25C.MACHINE WASH & HAND WASHplease remove the power bank out of your pocket and put the USB cable in your pocket before washing. It is recommended to use a washing bag for machine washing to better protect the product. When washing by hand, avoid rubbing the heating pad.Instructions for use: Plug in the rechargeable battery, press and hold the power button for 3 seconds to start preheating, then adjust to medium temperature. You need to keep connected to the mobile power.