【App-Controlled Stepless Temperature Adjustment & Heats to the Toes】The heated socks have far-infrared carbon fiber heating threads not only wired to the soles of the feet but also to the toes. When connected to the battery and the switch is turned on, the heated socks will warm up. Furthermore, the temperature can be controlled not only on the battery but also via an app. By connecting to a smartphone via Bluetooth, you can check and adjust the temperature of the socks on the dedicated app. Because individual differences in temperature perception and usage environments vary, arbitrary temperature control is possible with your smartphone. A wide range of temperature adjustments from 40 to 70°C is possible, and it is equipped with a timer function, allowing you to spend comfortably anytime, anywhere, from indoor use to winter sports. 【USB Rechargeable & Arc Design Battery 6000mAh*2】The heated socks come with two arc batteries. The ergonomic curved design comfortably fits the batteries to the calves without causing discomfort. They can be worn with boots. The battery has a large capacity of 6000mAh, allowing for continuous use for up to approximately 10 hours. The warmth lasts a long time, and it is suitable for various cold scenes such as outdoor work in winter, fishing, and skiing. 【Good Breathability & Washable】Made of high-quality 100% cotton, it has a soft and gentle touch, is gentler on the skin, and is anti-pilling, making it less prone to pilling. It is safe for sensitive skin. As thick heated socks, they not only provide cold protection and warmth but also excel in moisture absorption, breathability, quick-drying properties, and elasticity. The heated socks can be hand-washed or machine-washed. 【4-Level Temperature Adjustment with Battery & Safe and Warm】With PSE-certified electric sock-specific batteries, you can adjust the temperature in 4 levels (low temperature mode: 40°C, medium temperature mode: 50°C, high temperature mode: 60°C, highest temperature mode: 70°C). You can switch the temperature with one button, making it easy for beginners to operate. The battery is thin and lightweight, making it easy to move around. 【Package Contents】Heated socks body, 6000mAh dedicated battery * 2, 2-branch charging cable * 1, laundry net * 1, Japanese instruction manual * 1.