Long-Lasting 3.5-Hour Warmth:4000mAh dual polymer batteries provide continuous heat for up to 3.5 hours on a single charge. Keep your hands warm through long outdoor activities. 3-Temperature Intelligent Control:Choose from 3 precise heat levels (100-108°F or 109-117°F or 118-126°F) to match your comfort needs. Advanced heating technology ensures fast and stable warmth. Magnetic 2-in-1 Design:Unique magnetic connection allows two hand warmers to combine, providing warmth for both hands simultaneously. Perfect for shared use during outdoor adventures. Ultra-Compact and Portable:Measuring only 83×46×36mm and weighing 110g, it fits effortlessly into pockets and gloves. The sleek design ensures maximum comfort and portability. Instant Heating Technology:Experience immediate comfort with rapid heating activation. Reach your desired temperature within seconds for instant relief from the cold. Battery Capacity: 2000mAhx2 Heating Duration: Up to 3.5 hoursx2 Temperature Range: 100-126°F (3 adjustable levels) Input: Type-C 5V or 1A Rated Power: 10W Product Dimensions: 83×46×36mm Weight: 110g Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.