Specifications: Upper material:Comfortable,soft fleece; Color:Coffee; Voltage:5-6V; Wash and care:Hand washing by water, after washing,should be dry completely then use; Size:The insoles size is CN SIZE ; 35-36(230mm/9.06inch); 37-38 (240mm/9.45inch); 39-40(250mm/9.84inch); 41-42(260mm/10.24inch); 43-44(270mm/10.63inch); Please select insole in accordance with the size of the inner length of the shoe; Features: -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. -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. -Energy-saving environmental protection. Power less than 8W, an average of 125 hours consumption of 1 kWh. -Can be directly placed in shoes, easy to save. Feet separation, flexible and convenient. -Thermal,Electrically Heated,Hard-Wearing. -Power,USB socket, one end of USBpower line is connected with computer USB socket, and the other end is connected with insole. USB heating insoles have 3 kinds of heating methods: USB interface heating(Included USB cable); Power adapter heating (without adapter); Power Bank heating (without Power Bank); Package includes: 1x Heating insole + USB cable; (Does not include a power adapter); Note: - Please allow 1-3CM differs due to manual measurement. - Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.