Most traditional humidifiers would stop working at once when they are turned off. But SwitchBot Humidifier will keep running the fan for a while even when it was turned off.
This is an anti-microbial design for the SwitchBot Humidifier. After you turn the humidifier off, the fan inside the humidifier will keep running for a few minutes to keep the device dry. With this design, the humidifier will be protected from the bacteria and fungus.