Featuring a generous tank size, this units 30-hour runtime ensures that you can free your mind and not worry about refilling the unit. Instantly relax with the unit's nighttime glow, the soft lighting through the tank offers a peaceful ambiance, allowing a good night's sleep. Personalize your humidifier experience with the adjustable mist level. The user-friendly top-fill design makes refilling and cleaning both simple. The unit will automatically shut off when out of water, protecting you and your device. This unit is both ETL Certified and backed with the Winix 1 Year Warranty.