This heated insoles with three heating modes: USB interface, power adapter, and power bank. With built in micro heater chip, heat quickly and evenly, long service life. This warm insole feet warmer is soft and comfortable, with exquisite workmanship. Very good accessory for computer workers on cold winters. Features: ?THREE HEATING MODES?This heated insoles with three heating modes: USB interface, power adapter, and power bank. With built in micro heater chip, heat quickly and evenly, long service life. ?EASY TO USE?This electric shoe insoles is easy to use, just put in the shoes and connect the power to enjoy the warmth. This fit all kinds of shoes. ?SOFT AND COMFORTABLE?This warm insole feet warmer is soft and comfortable, with exquisite workmanship. Very good accessory for computer workers on cold winters. ?SAFE AND STABLE?Heating is stable, and safety is guaranteed. One USB cable connects the laptop or computer to heat 1 pair of insoles at a time, keeping your feet warm all the time. ?CAN BE CLEANED?Heating pad can be cleaned, be sure dried before use. but keep the interface out of the water. Specification: Condition: Brand New Material: Soft Lint Color: Brown Heating Time: 10 Mins Optional Size: 35 36(23cm/9.1in), 37 38(24cm/9.4in), 39 40(25cm/9.8in), 41 42(26cm/10.2in), 43 44(27cm/10.6in) Weight: Approx. 78 84g Package List: 1 * Pair of Heating Insoles Note: The default power of the heating pad is 5V/2A. If your charger power is not 2A, it may result in non heating. Powered by charger the heating power is 6 7W, if using the special adapter, the heating power will be 10 11W, 40% more heat than the charger does.