SMART HOME FRAGRANCE REFILLS - Two Birchwood Pine 0.33 fl oz smart vials with Puralast technology for NEST x Pura 3 and NEST x Pura 4 Diffusers. Replenish your current fragrance or easily switch to a new one. PERFECT FOR GIFTING - This holiday-inspired scent makes for an unforgettable Christmas gift. EARTHY GREENS & HERBS - White pine, fir balsam, and birchwood combine over a base of rich musk and amber in this warm, sophisticated fragrance, recreating the aroma of a majestic winter forest in your home. HOW TO USE - Use the Pura app to set your scent schedule, adjust intensity, or swap between scents in your Smart Home Fragrance Diffuser (sold separately). With Pura 4, fragrance vial is automatically detected, making scent recognition simple. CLEAN & CRUELTY FREE - These richly scented fragrance refills are vegan and made without animal testing. This two-pack is expertly crafted with the highest quality fragrances for 240+ hours of exquisite scent. SCENT YOUR WORLD - NEST New York’s fragranced home, perfume, and body care collections transform the everyday by artfully blending notes of the familiar, the exotic, and the unexpected for a fragrance experience like no other.