Air Innovations MH-505 1.37 Gal. Cool Mist Digital Humidifier for Large Rooms &ndash; Up to 400 Sq. Ft-Purple Runs Up To 70 Hours on One Tank Permanent Ceramic Filter  Never Needs Replaced Anti-Microbial Tank & Base - Freshen your space with pure, clean moisture Designed to operate quietly for uninterrupted sleep 4 mist settings, Auto shut off, and more!