Features: With built-in micro heater chip, heat quickly and evenly, long service life. Allowing cleaning with water for recycled use, but keep the interface out of the water. Provided with 1 pair of size reference sheet, you can cut arbitrarily according to the size number as your required. One USB cable connects the laptop or computer to heat 1 pair of insoles at a time, keeping your feet warm all the time. Very good accessory for computer workers on cold winters. Fit for all kinds of shoes. Specification: Condition: 100% Brand New and High Quality Material: Short Fluff + EVA Heating Chip Length: Approx. 17 cm / 6.69 inch USB Cable Length: Approx. 1.6 m / 5.24 feet Optional Specification: Brown Men, Brown Woman Quantity: 1 Pair Weight: Approx. 108 gPacking List: 1 x Pair of Heating Insoles 1 x 1.6 m USB Cable 1 x Pair of Size Reference Sheet Note: It has warm function only if it is powered by connecting USB cable to the computer, laptop or other available appliances. Once power off, there will be no temperature.