Feature 1 3 gear adjustable can be heated to about 55° 2 Can be washed it is recommended to buy two pairs of insoles and replace them in turn to extend the use time of insoles 3 Insole can be cut Suitable for all kinds of shoes very convenient 35 to 46 yards cut according to the dotted line according to the number of yards you need4 Keep your feet warm play a role in promoting blood circulation and other health effects Specification MaterialEVAColorBlack RedVoltage3 0 4 2VCharging time4 hoursBattery1900mAhTemperatureHigh temperature 55℃Middle temperature 50℃Low temperature 45℃Working time High temperature 3 hoursMiddle temperature 4 5 hoursLow temperature 6 hoursShoe size35 40 yards 41 46 yards Note Shoe code line printed on the insole can be cut according to the number of yards Package Included 2 X Heated Insoles1 X USB cable1 X Adapter1 X Remote control