High-performance air purifier and humidifier, PM2.5 compatible. - Brand: Panasonic - Model Name: ECONAVI PM2.5 - Functions: Air purifier, humidifier - Features: PM2.5 compatible Usage was simply filling with tap water, but there is discoloration on the sponge. I think there are no noticeable scratches on the exterior. No pets and non-smoking, so there are no particular odors. No box or instruction manual. Thank you. 【Additional Information】 There is discoloration on the dust collection filter (see the second to last image). I think the dust can be removed to some extent by vacuuming, but regarding the color, since this filter is not washable (probably a paper-like material), if you are concerned, you may want to purchase a replacement dust collection filter, "Part Number F-ZXJP50" (Please check the stock on the manufacturer's website beforehand.). If you are not concerned about that, you can use the included filter normally. It works without any problems. The top lid opens when powered on. It was used in a place not exposed to sunlight, so there is no deterioration or discoloration of the plastic due to ultraviolet rays. It hasn't been used in recent years and has been stored in a closet. Also, it was mainly used as a humidifier, so it was used almost only in winter. It may be shipped via Eco Mercari delivery (designated delivery location).