This little device is excellent! I was actually looking for something that I could have for cleaner air that was small enough to fit on a desk or shelf and this is just it. The battery lasts a while and it is so easy to charge and use, and the filter simple to clean. 

It is quiet enough that it is a small white-noise like machine too, which is known to help people focus!

I have been using it for the past week and would recommend to anyone who is looking for some cleaner air where they sleep or work