An ultra-quiet fragrance diffuser for spaces up to 1,000 sq. ft. Create schedules and control intensity with your phone using the ScentAir app. Pairs with Whisper PRO fragrance cartridges for even coverage for up to 300 hours. Fragrance cartridge not included. Best For You If: You want vibrant, noticeable fragrance across 3-4 medium-large rooms. Why You'll Love It: Android & iOS App Pairs with Alexa & Google Assistant Wi-Fi and Bluetooth enabled Customizable scent schedules Provides about 1 month of even fragrance Certified safe fragrance Pairs with Whisper PRO fragrance cartridges in 60+ pro-quality fragrances (sold separately) Whisper Pro User Guide