Self-regulating evaporating system* High & low output settings Filter included Walgreens pharmacist recommended.^ Up to 18 hours run time**, medium rooms***, 0.8 gallon capacity. 1 humidifier, 1 wicking filter. *Self-regulating evaporative technology adjusts output to the amount of moisture the air can hold at a particular temperature. **Up to 18 hours run time based on low settings. Run time will vary and is dependent on speed setting, room size and room humidity levels. ***Test data based on measurements in accordance with American National Standards Institute standard HU-1 2016. ^Our pharmacists recommend the Walgreens brand. Made in China 100% satisfaction guaranteed ©2021 Walgreen Co.