CoolMate HC-CMA-100D Misting Fan, Auto Every CoolMate fan uses the most energy efficient, water resistant electric motors available in the industry Improve air circulation by reducing dust and static electricity; Breathe easy! Improve the air quality in dry climates by adding moisture around you Patented misting head (Nano-Mist Generator) creates a dry, microscopic mist so ultra-fine it evaporates almost immediately once in contact Advanced circuitry built-in will automatically shut mist off after 4 hours of continuous use to prevent run out of water The maximum distance for the breeze's cooling effect is up to 6 feet (1.8 meters)