Ionizer
As an ionizer, it seems to work.  However, it extends from the wall a couple of inches or more making it hard to find an open outlet (most of mine are behind furniture in my bedroom which I bought it for).  After a couple of weeks, the soft air noise became  to louder noise that became annoying.  Seems to related to the fan.  Unplugged it.  Tried to fix it but couldn’t find a way to do so.  Disappointed.
Rating: 3 stars