HUMIDIFIER FILTER FREE VICKS Size: V4500 Filter Free Operation saves up to $40 dollars a year in replacement Scent Pad Heater provides optional soothing menthol (VSP-19) or Sleepytime Lavendar and Rosemary (VBR-5) vapors Protec Antimicrobial Cleaning Cartridge included-helps keep your humidifier cleaner, longer. Keeps cleaning for up to 30 days Adjustable Humidity Control Multiple output settings