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. Pair with premium fragrances created with ingredients that are safe and clean Together, smart vials and Puralast technology deliver a scenting experience of up to 120 hours Adjust fragrance intensity, set schedules and timers, and more in the Pura app Yuzu Citron: Energizing Japanese yuzu citrus, mixed fruits, and a colorful blend of florals create a scent with a refreshing citrus punch. Linens & Surf: Freshly laundered linens radiate jasmine and creamy coconut with splashes of refreshing sea spray. Pura fragrances are thoughtfully designed to never include harsh chemicals. We avoid ingredients known to cause potential harm to health or the environment. Every fragrance is safe and ethically sourced.