SAFETY REASSURING- Equipped with 6 Safety Protection Technologies, it has passed nearly 20 safety tests. AI Precise Temperature Control System and more advanced safety features to give you peace of mind when using it. Products are certified , CE, MSDS, FCC, EASY ADJUSTMENT OF THREE GEARS- 2 seconds fast heating with 3 heating settings for your choice: low temperature 35-42°C (95-107°F), medium temperature 42-48°C (107-118°F), high temperature 48-55°C (118-131°F), to achieve stable, adjustable, precise and comfortable heating effect. Provide you with instant warmth. 2-IN-1 DESIGN - A set of 2 symmetrical hand warmers that can be combined into a palm-sized hand heater, providing 360-degree warmth for your hands. Alternatively, you can use them separately, each hand holding one, The portable pocket design is suitable for travel, hunting, golf, hiking, camping, skiing, and more 10,000mAh large capacity charging case, each hand warmer comes with 2,000mAh built-in, even outdoors without worrying. This charging case features a USB-C charging port, which can usually be fully charged within 6.5 hours.It can be charged for 3 times in the charge case,which means outdoor enthusiasts can go on long hikes, skiing camping or fishing advetures with confidence. PERFECT GIFT: The Outdoor electric hand warmer is a must-have item in winter, It is small and lightweight and can be put in your pocket, gloves, or hat to ensure you stay warm during hunting, fishing, hiking, snow activities, and other outdoor activities. Whether it's Thanksgiving, Christmas, Valentine's Day, or Birthday, it's the perfect warm gifts for men,family, friends, and arthritis sufferers AI Hand Warmers