Winter electric socks, USB charging, remote control, outdoor warm socks, 3 levels of adjustable temperature, heating socksSpecification:M: The length of the tube is about 30cm/11.81 inches, the length of the sole is about 18cm/7.09 inches, and the width of the sole is about 8cm/3.15 inches.L: The length of the tube is about 33cm/12.99inch, the length of the sole is about 20cm/7.87inch, and the width of the sole is about 9cm/3.54inch;equipment:Surface material: 51% viscose fiber, 23% nylon, 26% polyester,Inside material: 100% nylonBattery capacity: 4000mAhCharging voltage: 5VWorking current: 800mAh-1100mAhOutput voltage: 3.7VCharging time: about 4.5-5 hours when fully charged (except for ordinary mobile phone chargers)packing list:1 * 1 pair of heating socks1 * USB data cable1 * English manual2*batterynotes:Due to the lighting effects and shooting angles, there may be a certain color difference, please understand.Due to manual measurement, product dimensions may vary.