Perfect humidifier for home, large room, office, greenhouse and warehouse. Each purchase is 1 unit. IMPROVE AIR : This humidifier with essential oil diffuser has a built-in generator to help improve air quality and improve your breathing while maintaining a comfortable humidity level. Ultra Quiet Auto Shut Off : Tired of other humidifiers with annoying noise, this whisper-quiet humidifier can solve this problem, the manufacturing technology of this humidifier has been upgraded, it is less than 24db and you can use it with No worries. COOL MIST TECHNOLOGY: This easy clean humidifier emits clean, uncontaminated mist that moisturizes the air, providing 8 to 24 hours of continuous operation to improve your breathing, sleeping. TANK: This heavy-duty humidifier has a large tank with variable mist control has a spray capacity of to quickly and efficiently spread humidity throughout your home, bedroom, and office. Use it in the nursery as it is safe as a baby humidifier.