"The ActionHeat 5V Battery Heated Sweater Jackets offer unparalleled comfort and excellent heating performance. This lightweight, but soft and wind-resistant fleece jacket provides excellent versatility for any adventure & weather. Using the patented 5V signal technology, it allows for most 5V batteries to be used with the ActionHeat Jackets and Vests. The ActionHeat Jacket comes with a super powerful ActionHeat 5V Power Bank 6000mAh. This power bank powers your garment and can also charge your phone, tablet, or any USB-charged device. Note: Heating times will diminish if used to charge other devices.