Warmth and heating There are multiple layers of zippers and buttons to adjust the size of clothing. So you don't have to worry that the size doesn't fit.Connect the connection cable in the bag to the mobile battery. Press the power button on the mobile battery to turn on the battery at the same timePress the power button for seconds to turn it on. up and the heated vest begins to function. The temperature test was done directly from the exothermic point. When you wear it, the heating level may decrease due to the extremely low ambient temperature. If the heated vest will not be used for a long period of time, remove the battery case and store it in a dry and ventilated place. Don't forget to remove the battery when washing. Hand washable or machine washable. If you want to use a washing machine, put it in the laundry net before washing. It is recommended to wash your hands so as not to damage the fabric of the electric vest.Easy button control Warm your body and promote blood circulationPromote metabolism, stimulate blood circulationRelieve Rheumatism & Muscle PainKeep the whole body warm in the Cold WinterWash with cold water, then air dryWashable, but you'd better to place the heated vest into a laundry bag