The ActionHeat 5V Battery Heated Base Layer Pants are revolutionary in the world of heated clothing. Using the patented 5V signal technology, it allows for most 5V batteries to be used with the ActionHeat garments. The ActionHeat heated pants come with a 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. The ActionHeat base layer pants are a great option for people who want to stay warm but not wear bulky layers. The pants are designed to be worn under another garment as a base layer. ActionHeat battery heated apparel utilizes innovative technology designed to warm the core body temperature. These revolutionary garments feature built in. heating panels and are made with ActionFlex material that provides lightweight warmth, comfort, and versatility.