The ActionHeat 5-Volt Battery Heated Vests are revolutionary in the world of heated clothing. Using the patented 5-Volt signal technology, it allows for most 5-Volt battery to be used with the ActionHeat Jackets and Vests. The ActionHeat Vest comes with a super powerful ActionHeat 5-Volt Power Bank 6000 mAh. 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. 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. ActionHeat heated garments use FAR infrared heating and ActionWave heat reflective technology to deliver hours of heat and comfort. ActionHeat allows you to stay warming and enjoy outdoor winter activities longer than ever before. HOW TO USE:1. Charge Up Fully charge power banks with provided charger kit. 2. Plug-In Connect the power bank to USB plug located in the pocket. 3. Turn on Press and hold touch-button control on the chest for 3 seconds. Press touch-button to adjust the temperature. Size: Large. Color: Black. Gender: male. Age Group: adult.