【Two 6000mAh Large Capacity Batteries Included】 This product comes with PSE-certified dedicated batteries, ensuring safety. The corners of the batteries are rounded, preventing discomfort on the calves. The 6000mAh large capacity is suitable for long hours of outdoor work and exercise, eliminating the need for frequent charging. A dual-head charger is included, allowing you to charge two batteries simultaneously, which is very convenient. 【30-70℃ Free Adjustment & App Temperature Control】 Compared to other products that only allow fixed temperature settings, these heated socks allow you to freely adjust the temperature from 30 to 70℃ to suit your needs, and can also set a timer. Rapid heating is also possible, allowing you to feel the heating temperature within 10 seconds of turning on the quick-warm switch. All functions are controlled via an app. Usage time is approximately 9-10 hours at low temperature (30-40℃), approximately 7.3-8.5 hours at medium temperature (40-50℃), approximately 5.5-6.5 hours at high temperature (50-60℃), and approximately 4-4.5 hours at ultra-high temperature (60-70℃). 【Carbon Fiber Heating Element】 Built-in carbon fiber heating elements provide stable and rapid heating. They are soft and flexible, and you won't feel any foreign objects even when stepping on them. Warming your feet from the cold helps prevent overall body chill. Warming your feet from the cold also improves blood circulation. Made of thick material, it has a soft and gentle texture, is gentle on the skin, and is safe for sensitive skin. In addition to being cold-proof and heat-retaining, it also excels in moisture absorption, quick-drying, and elasticity. It is extremely durable and comfortable to wear! It is breathable, keeps your feet comfortable during daily sports, and doesn't get smelly even after wearing it all day. When not using the heating function, it is warm enough as ordinary socks. 240