. Features: Long lasting - Typical Pura 4 users experience up to 45 days of premium scent when diffusing 2 fragrance vials for 68 hours per day. Automatic vial detection - Simply insert your smart fragrance vial and Pura 4 automatically detects the fragrance, creating a seamless swapping experience.. Smart features - Adjust fragrance intensity, set schedules and timers, and more in the Pura app. Pura fragrances are thoughtfully designed to never include harsh chemicals.. Refill for the Pura 4, Pura Plus, and Pura Mini Smart Fragrance Diffusers. Fragrance Family: Energizing Japanese yuzu citrus, mixed fruits, and a colorful blend of florals create a scent with a refreshing citrus punch.. This happy, invigorating citrus complements any space. Top notes of yuzu citrus and other tart fruits are balanced by a bouquet of fresh flowers, sheer musk, and white cedar.. Key Notes: Top: citrus, orange, grapefruit, strawberry, apple, rhubarb. Middle: peach blossom, goji, muguet, Egyptian jasmine, rose petals. Bottom: sheer musk, woody, white cedar.