We bought this to use on our cruise vacation. Now, I keep it beside me on my workstation. This is USB powered so its easily portable. I even tried to power it using an old 5000mAh power bank and it still ran for several hours on it.I wish the nightlight was instead control by a switch but pressing twice on the power button is not that bad.makes a cute little fan sound, and i don't sneeze as much but noticeable differences are hard to tell without looking at the filters after awhile.I purchased the Pro Breeze Mini Air Purifier with True HEPA Filter after an ongoing, unresolved matter of air quality where I work. The issue is difficult for me to briefly describe, but I will try. It began around four years ago when I began noticing a chemical smell in our office that no one else could detect. The best way to describe it is as though it's a chemical glue that someone is applying somewhere nearby. My manager was empathetic and had facilities management do an air quality check. They found nothing, and since no one else could smell it, I knew their conclusion was that it was just me. In the meantime, I couldn't help but notice that lots of people would sneeze throughout the day. There are around 30 people in my work area. The smell was strong enough that it made me somewhat nauseous and it would linger in my lungs even after I got home, though it wasn't nearly as strong. I tried researching this matter and most web sites attribute this type of odor that no one else detects to Phantosmia, which is a term for phantom smells or an "olfactory hallucination." After a week or so, the odor would dissipate, then resurface a few months later. A year and a half ago, we moved to a completely different floor in the same building. On that floor, the company occasionally moves employees around for various reasons. I had been sitting in the same spot for at least 6 months when, once again, they moved me to a different spot some 50 feet away. It is important to note that during those 6 months, I never once detected the chemical odor; however, on the SAME DAY that they moved me, I smelled it while at my new desk. As before, no one else could detect it. Due to my complaining of nausea, they once again called facilities management to my area. The lady asked if anyone else could smell it, and since no one else could, she walked around, and said she likewise could not smell anything. My explanation that I had sat at my previous location for all that time without EVER detecting it meant nothing to her. She walked away and closed out the ticket. I knew it was more than coincidence that I just happened to detect the same chemical smell the same day I moved to my new location. I know there must be something in the air where I work. For example, I know you can't see or smell asbestos, but exposure to asbestos fibers can cause lung disease such as mesothelioma, which can take 30 years to develop. Was I somehow detecting an odor that, with prolonged exposure, may cause lung cancer? With the understanding that this potential is not of any noticeable concern to the company where I work, and not wanting to be the guy known as a chronic whiner, I decided to look into getting something along the line of an air purifier for my desk at work. I settled on the Pro Breeze Mini Air Purifier and decided to give it a try. I've been using it for over three weeks now and so far it gets FIVE STARS. First and foremost, I have not noticed the chemical smell since the day I plugged it in. Second, I used to sneeze off an on throughout the day. Nothing major, but I would probably sneeze 3-4 times a day. I've noticed that I now very rarely sneeze. I think I sneezed one day last week. The unit sits behind my phone, largely out of sight unless I'm standing at my desk and looking down. Several individuals have asked me what it is and when I tell them it's an air purifier, I usually hear something like, "OH, I need to get one of those for MY desk!" Needless to say, three weeks into this purchase, I am very pleased with this product. Thank you!Thank you for the speedy delivery and for how easy it is to useWorks good but is for small area litter dust fills up outer filter very quickly so it does work but personally for myself I need a larger air filterIts perfect. Love it. I kinda wish it made more noise. I was hoping it would also serve as a sound background noise. I did wake up feeling my sinuses a little clearerTo small but it kept itJust press the button.