Ultrasonic Technology Essential oil tray Visible cool mist Auto shut-off. Adjustable mist control. 360-degree rotating mist nozzle. Clean tank technology.* Whisper quiet. Up to 16 hours run time. Small room 0.34 gallon capacity. Walgreens Pharmacist Recommended^ Learn more about Walgreens brand products ^Our pharmacists recommend the Walgreens brand. *Clean tank technology helps protect the tank from mold and mildew. This product does not protect users or others against bacteria, viruses or germs. Refer to the instruction manual for proper cleaning and care instructions. **Satisfaction Guarantee valid on Walgreens owned brand products only. Made in China 100% satisfaction guaranteed ©2021 Walgreen Co.