Bullet Points:1. Keep Warm in Winter: Keep warm in winter, preventing coldness and frostbite2. 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.3. 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.4. 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.5. Good for Heath: Release far-infrared rays when heated, 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: 3.7VBattery capacity: 2100 mACharging voltage: 3V-5VPower output efficiency: 98%Overcharge protection voltage: 5VOverload protection voltage: 2.85VCharging method: USB chargingSize: 35-40, 41-46 (can be cut)Temperature:High temperature level 60-65, use time about 3-4 hours, medium level 50-55, use time about 4-5 hours, low level 40-45, use time about 6-7 hours.Packing List:1 Pair of Heating InsolesRemote Control * 1USB Charging Cable * 1