Intelligent Magnetic Technology True double-sided heating with smart pause heating stops on the inner side when attached, ensuring safety and energy efficiency, while both sides heat up when separated for maximum warmth Long Battery Life Equipped with dual 5000mAh rechargeable batteries, offering 6.5-14 hours of continuous heating, ideal for all-day outdoor activities; can also serve as a power bank, charging your phone over 3.5 times 3s Rapid Heating Features four temperature levels ranging from 38 to 58 (100-136) with a memory function for a customizable and comfortable experience Ergonomic Design Smooth, velvety surface and a slim waist design for an optimized and comfortable grip, refined through hundreds of ergonomic adjustments Durable and Safe Built with advanced materials and certified batteries for long-lasting safety and durability; supports fast charging via a Type-C port, fully recharging in just 3 hours Specifications: Parameter Details Model UT3 Pro Battery Capacity 5000mAh*2 Charging Time 3 hours Usage Time (1 pack): 3.5-8.5 hours/(2 packs): 6.5-14 hours Input Type-C 5V2A Temperature Levels 4 levels: 100-109 (38-43) / 109-118 (43-48) / 118-127 (48-53) / 127-136 (53-58) Indicator Lights Red/Blue Package included: 1 x Hand Warmer (Left + Right) 1 x Charging Cable 2 x Lanyards 1 x English User Manual