PLEASE NOTE: The product comes with a Christmas card so you can give the product as a gift to your friends or family at Christmas. Multi-Functional USB Hand Warmer: Warm your hands and charge your devices outdoors with its powerful 3500mAh built-in battery and versatile USB output interface for mobile phones, tablets, and other gadgets. Therapeutic Heating: Freely switch between high, medium and low modes with the 3-gear adjustable digital display screen that shows the current temperature. Safety Features: With overheating, overcurrent, overvoltage, and short circuit protection, our USB hand warmer ensures a worry-free and comfortable experience. Stay warm with confidence, without risking battery damage or overheating. Take Warmth Anywhere: You won't feel the cold anymore with our USB hand warmer. It's easy to carry and store in your pocket or bag, making it perfect for outdoor winter activities such as camping, hiking, or skiing. Dual Heating Technology: Experience next-level warmth with our USB hand warmer that effectively heats both front and rear sides using advanced PI carbon crystal technology. Stay cozy all winter long.