Review on KOIOS H13 HEPA Air Purifier for Home, Small Room, Office Desk - Removes Pet Hair, Dander, Smoke, Pollen - 100% Ozone Free - Night Light by Gervan Mauldin

Normal product for a small home, two air speed settings, quiet mode is good, but the other speed is too loud to sleep at night. But in the worst case, the manufacturer offers a free add-on filter and a Revain gift card, as well as a 2-year guarantee, which they never want to redeem. Their customer service continued to urge customers to get them through Amazon, even though Amazon didn't offer these freebies and gift cards along with a two-year warranty. In any case, this was not a complaint by Amazon. They kept finding ways to turn down customer claims. Send them back to Amazon for a refund.