2024 Newest Technology: Charging case-An industry first for hand warmers, this revolutionary combines a high-capacity 10000mAh battery case with an innovative design. Its practical and stylish design makes it easy to carry while keeping your hand warmers charged and ready. Up to 36 hours usage time, perfect for all-day outdoor adventures or cold weather, it ensures you'll stay warm and comfortable with ultimate convenience. | Small, Double-Sided Heating: These portable hand warmers with dual heating surfaces to deliver consistent warmth on both sides. Designed with a small, lightweight body, it's more energy saving and ideal for both adults&kids to hold easily and comfortably | AI Temperature Management: 1s fast heating, 3 temperature settings. The AI system equipped with built-in sensors continuously monitors and adjusts the temperature to avoid overheating, providing a safe and comfortable experience. Constructed from high-quality, heat-resistant materials, the hand warmer is designed to be safe to touch and durable for long-term use. | 14000mAh total,Up to 36hours Usage Time: Set of two, Each hand warmer is 2000mAh, plus 10000 mAh charging case, the usage time will be up to 36 hours | An impressive gift: With unique design, long usage time, portable case, this hand warmer will be the best gift choice for a family member, a friend, a colleague, or a loved one