The new & improved Pura 4 is here — updating all of our diffusers to the new version + changing out summer for some fall scents New Pura 4 Features Include: Pura Smart Scent™ automatically detects fragrance vials, making scent recognition simple Scent remaining (coming soon) Quickly see the percentage of fragrance you have left in the Pura app at any time Automatically adjusts diffusion based on the temperature in your home A new, modern design fits flush to the outlet & features improved vial clips & lighting experience For reference our home is 4,500 sq. feet & we have 3 total diffusers; 2 upstairs on opposite sides & 1 in the common area downstairs. Home Must Haves - Home Fragrance - pura homerefresh fragrance homefragrance diffuser LTKHoliday LTKhome LTKfamily