Compact heating pads

This USB heating pad is 19.6*6cm, 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. 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