Honeywell Easy to Care Cool Mist Humidifier, HCM-710 Soothing, invisible moisture to relieve dry air discomforts 3 speed settings to adjust moisture output and sound level Runs up to 36 hours per filling on low setting Illuminated water window shows water level Wicking filter captures minerals from the water and helps prevent white dust in areas with hard water. To ensure stated product performance, use only genuine Honeywell Replacement Wicking Filter model HAC700. It is treated with Protec antimicrobial to inhibit up to 99.99% of mold growth on the filter.