A. Smart Sonic Electric Toothbrush B. Product Information 1. Name: Smart Sonic Electric Toothbrush 2. Model: C Series 3. Main power: 2.5W 4. Battery: 18500 type lithium - ion battery, 1200mAh, 3.7V 5. Charging base input: 5V DC, 500mA 6. Handle material: Plastic 7. Brush head material: Bamboo C. Toothbrush Storage and Charging 1. For the first use (such as a newly purchased product), or if it hasn't been used for more than 3 months, it may need to be charged according to the remaining power. 2. The suitable charging temperature is between 5 degrees Celsius and 35 degrees Celsius. If the temperature is too high or too low, the charger may not charge normally or may not charge at all. 3. To keep the battery fully charged, charging in two stages is recommended, which can also save charging time. 4. It is normal for the machine to heat up during use and charging. D. Charging Instructions 1. The charging time is about 7 hours. 2. The charging status indicator light first starts flashing, goes out after 3 seconds, and then enters the charging state. 3. When the intensity indicator light turns green and stays on, it indicates that the charging is complete. 4. When the intensity indicator light flashes yellow, it means the battery is low. Press the on/off button, and the yellow indicator light will flash for 2 seconds and then go out. 5. Battery information: When five LED lights are on at the same time, it means the battery level is over 90%; when four lights are on, it means the battery level is over 75%; when three lights are on, it means the battery level is over 50%; when two lights are on, it means the battery level is over 25%; when one light is on, it means the battery level is over 15%. If the yellow indicator light is on, it means the battery level is below 10%, and it will flash 4 times as a reminder.