PuRXium Free Standing Air Purifier has great features, first it runs so quiet that you can't even tell it's on, which is great! Next best thing is the filter, you don't have to spend a fortune on filters with my older model it was costing a bunch to replace,this one has a washable metal filter, excellent!! It has four settings for the fan, a sleep mode,a lock mode, and a hourly setting so if you only wanted to run one hour or eight,you can! It's free standing and doesn't take up much space at all. This is a very nice addition to my house. I'm really enjoying having fresh air to breathe!!