Note: Battery not included Keep warm and healthy: Heated socks upgraded to use fiber heating elements all around both fore foot and instep. Make your foot more comfortable and relax. High quality warm socks: This heated socks made from high-quality cotton fiber, function of absorbent, breathable, quick-drying and elasticity. Soft padded reinforced heel & toe. Prevent your feet from getting cold. Easy to control the temperature: 3 levels setting heat controller to adjust your favorite temperature.The three gear temperatures are 35, 45, 55. High quality rechargeable Li-ion batteries heated socks: The electric socks include pair of 3.7V 2200MAH rechargeable lithium polymer batteries. Heating up to 4-10 hours and full charge around 3-4 hours. Keep warm all day! Ideal gift in winter: Heated socks suitable for all kinds of outdoor activities in winter, such as fishing, camping, snowboarding, hunting, hiking, outdoor work, etc. Perfect warm gift for your parents and friends, have a warm winter together.