Manufacturer: Fujitsu General Deodorizer DAS-301R I have confirmed that it operates without any problems when left on all day. I previously purchased this as a powerful deodorizer. I used it for about 3 years, but it has been stored away since then. I understand that it is effective against pet ammonia odors and all kinds of household smells. It's an old item, but the quality is good. There are some points to note: 1. Two plastic pre-filters are cracked (I don't think it will affect the use much. If you are concerned, please glue them together). 2. There is no dust collection filter, so you will need to purchase one. 3. There are dirt and scratches. 4. Please forgive any dirt or dust that I couldn't remove (I apologize as I was busy and could only do minimal cleaning). 5. Please clean it before using it as there is dust. I don't have the original box, so I will need to get one. Therefore, it will take about 2 days to ship.