Evoke the essence of Italy’s Amalfi Coast with this exquisitely scented Smart Home Fragrance Diffuser Refill Duo featuring zesty lemon and orange bergamot blended with fresh mint and a hint of driftwood.   Cruelty-Free & Vegan Free from Formaldehyde, Parabens, Phthalates Smart Phone EnabledFlame-Free2 Vials, Up to 240+ hours of scent How to Use  This exquisitely scented NEST x Pura Home Fragrance Diffuser Refill Duo includes two smart vials with Puralast™ technology that can be used with any NEST x Pura 3 Diffuser or NEST x Pura 4™ Diffuser, each providing up to 120 hours of scent. When used in a Pura 4™ diffuser, fragrance vial is automatically detected, making scent recognition simple. Made in USA.