BEST FOR BEDROOM: The 3-liter tank provides 25 hours of moisture, helping you sleep comfortably for 3 nights without congestion, coughing, or dry mouth.EASY TOP-FILL&CLEAN:New one-step refilling process— pour water directly from the top opening.2-IN-1 DIFFUSER&HUMIDIFIER: Add 10-15 drops of your favorite essential oils to the base to create a fragrant home spa.PERFECT FOR BABIES:Your baby will sleep soundly and safely every night thanks to the auto-shut off feature and nearly silent operation.SIMPLE KNOB&NOZZLE CONTROL:Use the knob to control mist output and the 360° nozzle to direct mist anywhere you like.MORE EFFECTIVE:With a powerful and steady mistoutput, Dual 150 can raise humidity by 10% in just 20mins, faster than other humidifiers!GUARANTEED PURCHASE: With 2-year warranty and life-long service, you can contact our support team for a replacement whenever finding the product damaged or used.NOTE: Search LEVOIT 10-pack Humidifier Water Filters which can extend the life of your humidifier!NOTE: Please clean your humidifier before first use and on a regular basis to avoid possible mold or water particles.