Now with top loading glass, for easier use! No tubes or corks--simply add oil to the glass vessel, cover with the glass top and turn on. This glass holds more oil than the earlier hummingbird glass, meaning it will run longer without having to be refilled.The Mini is our most economical nebulizing diffuser. For being so small, its effects are quite powerful, and it fits easily into small spaces. The base measures approximately 4 x 2.5 x 2 inches, and we recommend this model for 500 square feet or less. The Mini isn't as quiet as our other models, and we offer it for those who want the benefits of a nebulizing diffuser without the higher cost. Like the other nebulizing models, the Mini uses no heat, thus preserving the therapeutic benefits of the oils. Comes with the glass nebulizer, a sample of lavender and full directions for use. For more versatile use, this diffuser can be purchased with a programmable timer.