Room Guard with Selectable Refills Replacement Bottle Room Guard Refill For Pollen and House Dust For Dust Mites *Set of 2 Quoted from the website: Simply plug it in and place it to neutralize pollen and house dust by promoting their fall*1 and preventing them from scattering*2. Ultra-micro particles prevent scattering indoors. *1 House dust (PM2.5, mold), pollen *2 House dust (dust mite feces, PM2.5), pollen Simply plug it in and place it to suppress the production of dust mite excrement*1 with ultra-micro particles and neutralize dust mites*2. *1 Suppresses the production of dust mite excrement by continuing to use for 1 week. Effects vary depending on the usage environment. *2 Weakens the ability of dust mites to cling to carpets, etc. [Product Features] For spatial prevention. Ultra-micro particles spread throughout the room. Please use with the main unit and refill set. ・Room Guard main unit with selectable refills : Can be used with all refills ・Just plug it in and place it ・Select a refill according to what you want to address Please refrain from purchasing if you are concerned about storage at home.