Material: nano-composite carbon fiber, pure cotton Maintenance: hand wash, water wash, dry cleaning Service life: 8000~10000 hours Product temperature: 25~45 degrees Celsius Precautions: 1. Use a special charger, turn off the power when replacing 2. Do not disassemble the battery privately. It is strictly forbidden to expose the battery to water or open flames 3. Stop using the electric heating or battery immediately. Instructions for use: 1. Power button operation: plug in the power, long press to turn on, long press to turn off. 2. Button mode: high temperature (three indicator lights on), medium temperature (two indicator lights on), low temperature (one indicator on), click the button, cycle mode. 3. High temperature is about 40℃-45℃, medium temperature is about 35℃-40℃, and low temperature is about 25℃-35℃