Quick summary: this fan provides sufficient airflow for personal cooling (much more than most small USB or battery powered fans provide), in a compact package with good battery life and multiple charging options. The only flaw so far is that it is too easy to activate it accidentally. Full review: To set the context, heat is my enemy. I hate warm weather. I keep my house at 68F and I always have a fan running at my desk or beside my bed. So when planning a two week trip to Italy in the summertime I knew I would want to bring a fan with me. In the past I have used the small 4” diameter USB powered fans that are commonly sold on Amazon but the airflow is weak and they wear out and begin to rattle quickly. They also require a USB power source at all times. I also use a Ryobi portable jobsite site fan sometimes but it is too large and heavy to pack. The ideal portable fan should produce ample airflow, pack relatively flat, store enough power for a decent runtime, and be easy to charge. Durability and quiet operation are important factors as well. This fan (The oddly named Koonie) delivers on all counts. Airflow is excellent. Most of the time I have it on the medium setting. It is quiet, and more compact than I expected. The clip folds sideways making the whole fan about 3-4” thick when packed flat. It’s not exactly small but I had no trouble fitting it in a day pack when traveling. I haven’t tested the total battery life yet but after a couple of hours on a train it was still showing full charge (more on that later). It charges with both micro USB and USC-c, which is great. More importantly it will run while charging, so you can power it with a USB-c charger all night and then take it with you on a day trip first thing in the morning. The clip is quite effective and I’ve had no trouble attaching it to a variety of mounting points. I’ve included a photo of the fan clipped to the overhead luggage rack in an Italian train. Overall, this fan has checked all my requirements, and I sincerely wish I’d had this years ago. Nit Picking: - The button that activates the fan is flush with the back surface, and while it’s a perfectly nice, clicky button, it is easy to activate the fan when it’s packed in luggage or a backpack. I found it running on more than one occasion. I plan to put a layer of packing tape over the button to reduce accidental activations. - The battery life indicator is nice to have, but could stand to be more granular. It has four levels: 100%, 60%, 30% and nothing (all lights dead). Many fans have no charge indicator at all, so this is hardly a complaint worth mentioning. Other than that I can’t find anything to complain about. The build quality is higher than I expected and I don’t think it will break unless abused. I should note that I don’t know what sort of bearings it has, so longevity is uncertain. I also haven’t fully tested the max runtime. Other than that I can confidently recommend this to anyone who needs a portable, compact, battery powered fan. Update: I’ve had the fan for a year and a half now. It worked through my trip to Italy, and I’ve since taken it on a number of camping trips, replacing the Ryobi jobsite fan I used to bring. It lasts for many hours, and I’ll clip it to my cot and run it all night. I was in a wedding last summer, and I knew that being in a tux in the heat was not going to be awesome. I brought the fan along with the rest of my clothing and stuff for the day. I found I could easily clip it to places like the table I sat at during the rehearsal dinner and reception (I clipped it upside down, hanging below the table, aimed up at me from the side) and many other inconspicuous spots. It was quiet, discreet, and effective. Heat is my weakness, but this fan is my secrete weapon. I’m quite pleased with it. I’ve also run it for days on end at my desk. It is every bit as quiet and powerful as it was when I got it.