Specifications: Large Battery Capacity: Equipped 4000mAh large capacity battery ensures long time work without frequent charging providing you with up to 20 hours enduring warmth. 3 Adjustable Heated Levels: The heated socks are designed with 3 heat settings including high temperature (55 degrees Celsius 7h) medium temperature (45 degrees Celsius 11h) and low temperature (30 degrees Celsius 20h) to meet different demands. Remember to be fully charged for the first use. Premium Material: Made of 82% cotton 14% polyester and 4% spandex the heated socks have a certain elasticity making the socks more comfortable soft warm and breathable. The embedded heating element heats the sole of the foot bringing heat to you at all times and you can feel the heat without touching it. Universal Heated Socks: Unisex heated crew socks have one size for most people. And they can be hand-washed or machine-washed. When machine-washed you only need to put it in a laundry bag which is very convenient. Perfect for Winter: Rechargeable heated socks are ideal for a variety of indoor and outdoor activities in winter such as skiing fishing hunting snowball fighting camping climbing cycling etc. Its a perfect gift for friends parents and elderly. Item Name: Heated Socks Material: Polyester Cotton Spandex Power: 10W Voltage: 3.7V Heated Area: Sole Color: Black White Size Type: One Size Thickness: Thickened Sock Height: Crew Sock Applicable Season: Winter Applicable Gender: Unisex Charging Time: Less than 8h Gear Adjustment: 3 Gears Adjustment Applicable Age: Youth (18-40 Years Old) Machine Washable (in Laundry Bag): Support Battery: 1 x 4000mAh Rechargeable Battery (Included) Features: Adjustable Temperature Comfortable Long-Lasting Heating Breathable Well Crafted Full Power Using Time: 7h for High Temperature 11h for Medium Temperature 20h for Low Temperature Temperature Gears: Third Gear (55 Degrees Celsius) Second Gear (45 Degrees Celsius) First Gear (30 Degrees Celsius) Size: 28cm x 22cm/11.02 x 8.66 (Sock Bottom x Sock Height) (Approx.) Notes: Due to the light and screen setting difference the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Pair of Heated Socks 2 x Power Banks 2 x USB Cables