Prepare your mind and body for a peaceful sleep with this NEST x Pura Smart Home Fragrance Diffuser Refill Duo featuring calming, comforting, and soothing notes of chamomile, driftwood, sandalwood, and vanilla bean.  Gourmand Wood Cruelty-Free & Vegan Free from Formaldehyde, Parabens, Phthalates Smart Phone Enabled Flame-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. Weight:2 x .33-oz . Made in the USA.