The Summit Battery Powered Handwarmer can turn a miserable hunt into a great day in the field. Internal heating elements maintain a warm interior with plenty of room for your hands. A rechargeable lithium battery provides continuous warming power for up to 4 hours. The removable lithium battery doubles as a charging station with dual USB outlets for smartphones and more. An adjustable waist strap allows the hand warmer to be easily worn on the outside of bulky cold-weather gear. A durable nylon shell ensures many warm hunts ahead.