Far superior to other diffusers, it uses no heat or air pumps (which can seriously damage the chemistry of essential oils), and safe low voltage direct current. They harness the science of ultrasound to deliver micron-sized essential oil droplets so fine that within a moment of leaving the diffuser, the cool mist becomes a vapor, incorporated into the atmosphere and spreading evenly throughout your room. Colored lights options set the mood. For healthful sleep, all lights can be turned off (including the red power light) while diffusion continues. Depending on room size, relative humidity, mode and volume settings chosen, it can last the night through without refilling. When the water level gets low, the diffuser shuts itself off. HOW DO THEY WORK? Using ultrasonic “cold mist” technology, high frequency sound (100 times beyond human hearing) generates patterns of movement that create “sonic bubbles” in the water in the diffuser's bowl. When these bubbles implode, nano-droplets of water are released from the surface. Each is enveloped by a fine coating of essential oil as they float up and rapidly become part of the atmosphere of your room.Perfect for enjoying your favorite essential oil aromas. Or, you can diffuse such small amounts of essential oil that the aroma is barely perceptible. Even at such low concentrations, you can benefit from the therapeutic effects of essential oils, and help to restore balance to the microbial population in your indoor environment.