Descriptions: This USB heating pad is19.66cm, heating temperature is 35-50 degrees.It is safe and easy to use. It is mainly used for the heating of insoles, slippers to keep warm. Light in weight, easy to carry. Features: Mainly used for the heating of insoles, slippers to keep warm. This USB heating pad is 19.66cm, heating temperature is 35-50 degrees. Light in weight, easy to carry. It is safe and easy to use, and can be fixed around the sewing. Heating Film can be washed, bent, rubbed and folded. Specifications: Material: carbon fiber Color: black Maximum voltage: 5V Power supply mode: USB Heating film:19.6 x 6cm/7.72 x 2.36inch Wire: 1.5m/59.06inch Heating temperature: 35-50 degrees Package Included: 1 pair x USB Heating Pad Note: Only in the insulated environment such as sewing between clothes or a quilt, it can be heated to about 35 to 50 degrees, and the heating time will be 20 to 40 minutes.