Parameters: Product Name: Electric Socks Product Color: Black Product Weight: 260g Product Voltage: 3.7v Temperature Range: 43-60 Number of gears: 3-speed temperature control Product Material: Cashmere Capacity: 4kmA/pcs. Suitable for foot range: 36-45 yards Packing list 1 pair of socks 2 rechargeable socks 1 x Dual Tip USB Cable Soft, comfortable and durable: Heated socks are made of safe materials. Breathable, quick-drying, specially formulated flame retardant cotton makes you feel safe during use. What’s more, the far infrared heating elements of heated socks stimulate blood circulation. Heated Loop Socks: Our heated rechargeable socks are equipped with two 4000 mAh lithium polymer batteries that provide up to 5/6-12 hours of heat. With 360 degrees of even heating, you can do everything in comfort. 3 adjustable temperatures: Heated battery-operated socks have 3 temperature settings High (149F, 5-6 hours), Medium (131F, 7-8 hours) and Low (113F, 10-12 hours). You can adjust the amount of heat you need, depending on hot and cold conditions. The best gift for winter. Our heated socks are stretchy, unisex and suitable for most people. A great winter gift for yourself, family and friends. Machine washable, please remove the batteries and place the heated socks in the laundry bag before washing to avoid tearing the charging cable. Multi-functional socks: Smart electric socks are not only suitable to wear around the house to keep warm. They are also suitable for cycling, skiing, horse riding, ice fishing, hunting, running, hiking and so on. Keep your feet warm while working outdoors in the cold winter, the element of far infrared heating can simultaneously promote blood circulation, and is also an ideal tool for hot compresses.