Keep Warm in Winter: Keep warm in winter, preventings coldness and frostbite. Can be Cut: There are yardage cutting lines on surface, can be cut to the desired size according to your needs, the arch is more fit and comfortable. Temperature Remote Control: Designed with temperature remote control device, different buttons on the remote control are used to control different operation modes, and the temperature can be controlled according to your own needs. Battery Powered: Built- in lithium battery, ready to use when fully charged, no need to tie the battery, no need to connect to power supply. Good for Heath: promote blood circulation, prevent frostbite, relieve menstruation and invigorate blood, relieve fatigue, etc. Insole use instructions:1. Long press switch for 3 seconds, the LED indicator lights up, the red light turns on, indicating high temperature.2. Click again, the blue LED light is on, indicating medium temperature.3. Click again, the green LED lights up, indicating low temperature.4. Press the off button on the remote control to turn off. Remote control operation1. Press the remote control H/ ON to turn on the high temperature.2. Press the remote control M to turn on the medium temperature.3. Press the remote control L to turn on the low temperature.4. Press the off button on the remote control to turn off.Specification:Name: Electric Heating InsoleMaterial: EVAVoltage: 3.7V Battery capacity: 2100 mA Charging voltage: 3V-5V Power output efficiency: 98% Overcharge protection voltage: 5V Overload protection voltage: 2.85V Charging method: USB chargingSize: 35-40, 41- 46( can be cut)Temperature: High temperature level40℃ Packing List: 1 Pair of Heating Insoles Remote Control*1 USB Charging Cable*1Notes: 1. Only sell main products, not other products.2. Since manual measureme