2 Pairs USB Shoe Dryer Electric Insoles Shoe Winter Keep Warm Heated Insole for Shoes Boot, Size:39-40

Features:
Upper material: comfortable,soft fleece
1. Pay attention to materials: Far infrared carbon fiber, through a special process to produce a thickness of only 0.02cm/0.01", soft sheet heating material, its heating evenly, high heat conversion rate, rapid heating, soft and comfortable
2. safe and reliable, the output voltage of the USB interface is only 5V, the output voltage of adapter is only 6V, and with voltage regulator protection device, the two output voltage is lower than the body safety voltage 36V.
3. energy-saving environmental protection. Power less than 8W, an average of 125 hours consumption of 1 kWh
4. practical. Insole directly placed in shoes, easy to save. Feet separation, flexible and convenient

Specification:
Power: USB socket, one end of USB power line is connected with computer USB socket, and the other end is connected with insole
Wash and care: hand washing by water, after washing,should be dry completely then use.

Size:
35-36（23cm/9.06" ）， 37-38 （24cm/9.45" ），39-40 （25cm/9.84" ），41-42（26cm/10.24"），43-44（27cm/10.63"）

Note:
1. please cut down the powerin time when you don't use, avoid heating for a long time
2. elderly and children should use under guardianship.
3. no use of insoles for doing strenuous exercise, to protect the heating chip