The PureGuardian 90-Hour Smart Mist Ultrasonic Humidifier combats dry air anywhere in your home. It features both warm and cool mist settings, and Smart Mist Technology monitors humidity levels to keep the air at your desired levels of humidity. Use the extension wands to disperse an even mist in large rooms. | PureGuardian H7550CA Elite 90-Hour Smart Mist Ultrasonic Humidifier