3. Low-level, LED light displays three, output power is 40%.Size: 23X28X9.4CM High-quality Material: This heating stocking is made of 80% cotton, 12% polyester and 8% elastic fiber material, so it is absorbent, breathable, quick-drying, and elastic.Color: black, grayMid-level Two light heating for about 4.5 hours2. Mid-level, LED light displays two, output power is 70%.1. After the thermostat is connected to the power supply (battery), the one, two and three lights flash once. Long press the button for 2 seconds to start and enter the preheat mode, the LED shows one with breath flash. High output with output power of 100%, heating automatically changes to mid-level after 5 minutes.Three-speed thermostat Automatic Level Adjustment(preheating function)Heating Socks 2，2 X 3.7V 2200mAh rechargeable batteries, and usb charger cable.Battery size: diameter is about 1.8CM/0.71in; height is about 6.5CM/2.56inHeating time: High-level One light heating around 3 hoursSuitable Occasions: Focusing on the toes to the feet from getting cold, which can promote blood circulation. Apply to feet and long-term cold feet and stiff joints, giving you a warm winter.Charging time: The battery takes about 4-6 hours to fill4. Click to switch level button with three levels cycle, long press 2 seconds to shut down.Heating Piece: The heating piece is inside the sock. Specially designed battery pocket is safe and easy to carry.Material: cotton fiber socks, heating Size: all size suitable season: winter Applicable gender: neutral/male and femaleLow-level Three light heating for about 7.5 hours