The nebulizer can be filled with water from above on the spot and controlled via the LED display. The "Auto" mode automatically and reliably humidifies the room air to an optimal 50% relative humidity. This value is measured by the built-in hygrometer and can be adjusted as desired. The display provides an overview of all functions and maintenance reminders. In summer, the U350 refreshes with cooling mist, while in winter it warms with soothing humidifying mist. Essential oils can also be used for room fragrance, depending on preference.