Waterless atomization: easy to operate, no need to clean the water tank Innovative high-frequency vibration atomization replaces the air nozzle, no heat, cold fog without water condensation, and extremely low noise. You can enjoy the benefits of high-fidelity aromatherapy in a healthy, convenient and quiet way. Ultra Quiet: Adopting a silent design, it only produces a sound below 38 decibels, very quiet, allowing you to have a perfect sleep. You can enjoy aromatherapy with almost no noise. Versatile: This unit can be used in large rooms up to 700 square feet. It has a 1 or 2 or 4 or 8 hour auto-off timer and three spray modes, so you can determine how much it works and how strong its fragrance is. Note: Do not use it tilted or upside down for a long time, and clean the machine with alcohol regularly. If you need to take it with you, please replace the essential oil in the machine with an empty bottle.