Boost your energy and brighten your mood with this NEST x Pura Smart Home Fragrance Diffuser Refill Duo featuring invigorating notes of lime zest, green tea, clary sage, and bergamot.  Cruelty-Free & Vegan Smart Phone Enabled 2 Vials, Up to 240+ hours of scent Free from Formaldehyde, Parabens, Phthalates Flame-Free How To Use: This exquisitely scented NEST x Pura Smart Home Fragrance Diffuser Refill Duo lets you replenish your current fragrance or switch to a new one with any NEST x Pura 3 Diffuser or NEST x Pura 4™ Diffuser. Includes two vials, each providing up to 100 hours of scent. Weight:2 x .33-oz.