Simply Earth's Essential Oil Diffusers combine the benefits of aromatherapy, aqua therapy, and light therapy. This contemporary and elegantly designed diffuser can store up to 200ml of water. Features: - Runs up to 4 hrs. - Timer options for 2hrs or 4 hrs. - Over 250 sq ft coverage. - Light has 7 colors. - Auto shut feature when the water is low. - 100% BPA free.