Rechargeable handwarmers in two pack. Core modular handwarmers 10,000 MAH battery replaceable, hand warmer, USB – C, portable charger, perfect for golf, hunting and other outdoor activities. Great gift for the men in your life! Detachable power bank, and heating case. The world’s first modular, rechargeable, hand warmer. The union 5S is composed of a union core – 10,000 MAH battery bank and the union case – heating housing. it enables you to replace the battery or heat casing as needed. Refill your hand warmer in seconds for another 15 hours of warmth. It will accompany you throughout your day of activity. It provides faster heat, larger service, and a comfortable warmth, like you’ve never felt before. this hand warmer features a unibody high-grade brushed aluminum casing with a 30% bigger heat surface than previous. Spread the ideal warmth from your palm to your fingertips. You can always have your comfortable heat with four temperature ranges from 145° and up. New and in factory sealed box!