Air Refreshener: The unit will pull the air from the room into the base of swirling water. The water acts as a filter, trapping particles and releasing fresh moist air into your room. Aromatic Oil Diffuser: Add a few drops of the included Lavender oil to neutralize unpleasant odors, reenergize stagnant stale air and add a fresh scent to any room. Larger Size with Safety switch: Diameter: 8.75 inches, Height: 8 inches, the larger base holds more water and covers approximately 600 square feet. The built-in Safety switch automatically turns the unit off when the top is lifted. Easy to clean: Simply dump the water out and fresh water and oils daily. We recommend EcoGecko oils as they are specially formulated for our units.