5-Layer Sterilization, Automatic Constant Humidity, Steam & Ultrasonic Hybrid, Top-Fill, 60-Hour Continuous Operation, "Cool + Warm" 6-Level Adjustment, 30 Tatami Mats (approx. 495 sq ft), Timer, Quiet Operation, Dry-Run Protection, Humidifier, Easy to Clean, Visible Water Level, 4 Outlets, Aroma Compatible, Hay Fever/Dryness Prevention, Bedroom/Office/Living Room, PSE Certified 9L Large Capacity & Hybrid Humidifier Don't you want to be free from the stress of running out of water in your busy daily life? With a 9L large-capacity humidifier, you can operate continuously for up to 60 hours on low mode. No need for frequent refills on weekends.