The app-based device connects to your phone, allowing you to set your scent schedule, swap between scents, and adjust intensity from anywhere. Swap between fragrances with two included vials that together scent up to 1,000 sq ft with 700 hours of scent.Additional Smart Home Fragrance Diffuser Refills in a variety of scents are available and sold separately.Scents:Bamboo: Floral | Grapefruit: Fresh