Air Innovations MH-701B-BLK Humidifier Black w/2 pk Demineralization Filters Compact & Silent Uses Ultrasonic Technology Permanent Ceramic Filter helps eliminate hard water deposits and other impurities Features Rotating Mist Nozzle and Variable Control Dial Antimicrobial Protection helps prevent microbial growth in the Tank & Base Includes Auto Safety Shut Off when Tanks are out of Water