From the Manufacturer:
GuruNanda Globe™ Diffuser is a large room diffuser with a 230 ml water tank, which means it can diffuse for up to 18 hours in a room and as far as 250 feet away in the intermittent mode! It includes an auto-shut off safety feature for safety and satisfaction, flashing LED lights and a premium ultrasonic technology to diffuse your choice of 100% pure essential oil or essential oil blend without generating heat so that the quality of the oil properties is neither damaged nor compromised. Simply fill with distilled water and add a few drops of one of your favorite GuruNanda Essential Oils. The ultrasonic diffuser creates vibrations that are carried to the surface where oil is floating. The oil floating on the top of the water gets broken down, and then diffused into the air, filling the surrounding space with a purifying aroma.