Muddy Nucleus 3.7V Power Bank - Late-season whitetail hunters require layering systems that work a little harder, offering up more than warmth to outlast all-day sits through winter's worst weather. And, because long, cold sits quickly deplete their body warmth, they need gear ready and willing to do some of the work for them. A staple in this new lineup, the 3.7-volt, 3,500mAh Nucleus Power Bank keeps all your heated gloves and socks charged up on the go and operational during all-day sits. This compact, rechargeable bank includes one USB-C charging cable. Comes as a set of two. Features Rechargeable 3.7-volt, 3,5000mAh power banks make it simple to keep the Nucleus heated apparel and accessories charged on the go; Including USB-C charging cable recharges batteries back to full capacity in as little as 3 hours; Comes with 2 power banks;