Ion generator with operation mode switching function. - Model Name: IG-EX20 - Year of Manufacture: 2020 - Functions: Operation mode switching, filter cleaning, reset button - Accessories: Power adapter, power cord Thank you for viewing. As shown in the photos, operation has been confirmed. I haven't used it for many years, so I'm listing it because I probably won't use it in the future. I don't know the market price, so I've listed it as an auction.