10000mah Battery Includes】- Search this ASIN to buy an extra battery pack: B099WQD27D【Quality Material】 HEATOO Heating vests with a slim-cut design offer you a snug fit, and the Nylon fabric with pure cotton filler makes it extra comfortable to wear and dry quickly in rainy or snowy weather. 3 Size electric coats with YKK high-quality zipper.【4 Heated Elements Around You】New and improved heated elements across the left and right sides of your body's core, in addition to the collar and back heating areas, allow for more warmth in your abdomen area and your hands. With 3 temperature settings, you're free to adjust a level of heat (131℉-113℉-100℉) best fits you with a simple press of the button. Because of skin sensitivity, you will feel the collar is heating more than other parts, In fact, the power of the heating panels is the same.【Fast Heating & Long Working Time】Long press the button turns to preheat, Warming vest will be fast heating in seconds with a 7.4V UL/CE-certified battery, providing up to 10 hours of heat(4 hours on high, 6 hours on medium, 10 hours on low heat). Built-in thermal protection module to prevent the electric vest from overheating. The USB port can be used for charging smartphones or other mobile devices.