3. It can be directly plugged into the computer host for charging using USB alone (USB socket, in line with 500MA)
4. The charging indicator at the bottom of the candle will turn red when plugged into the power supply, indicating that it is in a charging state. If the indicator is off, it means that the battery is full. Automatic power off, simple and safe.
The charging time should not be too long, and the charging time should be controlled at about 2 hours.