All it takes is just a few drops from the 100% natural botanical solutions to clean the air around you. While the energizing, invigorating or relaxing fragrances last up to six hours, the deodorizing, antibacterial properties continue for 24 hours as long as the Brethe machine is running. Safe for all rooms and not harmful to pets. Environmentally safe, non-toxic, non-pollutant, non-flammable, biodegradable and alcohol free. Lime and Citrus solutions provide a fresh, clean scent. Vanilla and Lavender solutions provide flavorful and relaxing scents. Each 8-ounce bottle sold separately. Imported.