This 3.5L cool mist humidifier sustains operation for up to 28 hours, moisturizing areas up to 430 square feet. It swiftly alleviates congestion, cough, or dryness symptoms without frequent refills, ensuring uninterrupted sleep. With an automatic shutdown feature, it guarantees safety and prevents damage from water depletion. This humidifier features 3-speed adjustment, allowing you to easily control the mist output to your desired humidity level with just one touch. Its powerful 200mL/h output releases fine, clean mist, while nano-sized water molecules prevent impurities, avoiding residue on furniture. The humidifier is BPA-free and exceptionally quiet, operating at less than 24dB—quieter than a whisper—to ensure a peaceful night's rest. Additionally, you'll appreciate the gentle, soothing night light for a warm home ambiance, which can be easily turned off at any time. The humidifier features a top-fill design, making it easy to replenish and clean. Simply open the top lid, and you can add clean water directly to the tank through the wide opening, eliminating the need to disassemble the device for refilling. Additionally, the large-mouthed water tank is easy to clean, eliminating concerns about cleaning in gaps and corners.