Starter Set Includes: 1 Pura 4 Smart Fragrance Diffuser, 1 Pura Pacific Aqua Fragrance Refill, & 1 Pura Linens & Surf Fragrance Refill. The Pura 4 smart fragrance diffuser uses innovative smart features paired with premium, clean scents to give you the most modern, customized, and high-end scenting experience possible. Simply insert your smart fragrance vial and Pura 4 automatically detects the fragrance, creating a seamless swapping experience. Adaptive diffusion technology reads the room's temperature and adjusts according to your preferences for a consistent, reliable scenting experience. Adjust fragrance intensity, easily switch between fragrances, set schedules and timers, and more—all from the Pura app. All our scents are created with clean ingredients and are safe for kids and pets. For more on what we do and don’t include in our scents, see the Pura Promise.