Smart electric socks: control your foot temperature at all times from your mobile phone. In addition to the mechanical control of the battery temperature, our heatable socks can be controlled by downloading a mobile phone app, so you no longer need to bend over to use them. The battery is compact and portable, and the sock pockets are ergonomically curved to fit your calves perfectly, with no foreign body sensation.5000 mAh capacity: the rechargeable electric sock comes with 2 batteries. First gear corresponds to 45C/113F (10-11 hours of operation), second gear corresponds to 55C/131F (7-8 hours of operation), third gear 65C/149F (4-5 hours of operation). Equipped with a Type-C dual interface charging cable, both batteries charge efficiently at the same time. When the green light of the battery blinks four times, it is the battery to 1 is 00% charged. Blink 3 times, charging 75% and so on.COMFORTABLE AND DURABLE: The socks are made of 25% (Modal Core Yarn + Mink Wool + Anti-Pilling Acrylic), 30% Viscose Fibre, 18% Nylon and 27% Cotton. On top of the original, it has extra thickness and excellent elasticity to keep you warmer in winter. The heated part of the sock wraps 360 around your feet and thanks to the breathable, quick-drying, specially developed flame-retardant cotton, you feel safer during use.One size battery heated socks: The socks are relatively flexible and fit most adult men and women. For cleaning your socks, you can choose between hand washing or machine washing. You will need to remove the batteries and place the socks in a mesh bag before washing them in the washing machine. The power connector is waterproof design, sealed and waterproof.MULTIFUNCTIONAL DISPOSABLE SOCKS: Smart electric warm socks are not only suitable for wearing at home to keep warm, but also suitable for cycling, skiing, horseback riding, biking, ice fishing, hunting, running and hiking. Work outdoors and keep your feet warm in the cold winter, the far infrared heating element promotes blood circulation and can also be the perfect tool for hot compresses. This is the perfect winter gift for your family or friends.