NEST New York is elevating the world of electronic home fragrance with this plug-in unit that surrounds you with NEST New York fragrances of your choice (sold separately). Flame-Free Continuous fragrance for up to 30 days Good for households with young kids, and petsSimple and convenientDevice plugs into wall outletEach refill provides 30 days of continuous fragrance. Discover one of our many other artfully blended fragrances with our collection of Wall Diffuser Refills, sold separately.