Unit produces warm, 99.9% germ-free mist in less than a minute Digital control panel allows for easy operation Programmable humidistat gives you the freedom to customize the mist settings Essential oil cup lets you use the unit as an essential oil diffuser 5.7-litre tank allows for up to 24 hours of use before it requires refilling Top-fill humidifier is easy to refill and clean Automatic shut-off when empty provides peace of mind