The ActionHeat 5V Battery Heated Base Layer Shirts are revolutionary in the world of heated clothing. Using the patented 5V signal technology it allows for most 5V battery to be used with the ActionHeat garments. The ActionHeat Shirt comes with a powerful ActionHeat 5V Power Bank 6000mAh. The ActionHeat Base Layer Shirts are machine washable and include a 6000mAh power bank and charging kit. The ActionHeat Shirts have touch-button technology with 3 heat settings (High (Red): 150F – 2+ Hours Medium (White): 130F - 3+ Hours Low (Blue): 110F – 4.5+ Hours).