Review on 🔋 O2COOL Treva Portable Battery Operated Fan - 10 Inch Blades - Smart Power Air Circulator for Camping, Travel, and Indoors Use - Includes AC Adapter, Rechargeable Batteries, and USB Charging Port by Bobby Lawson

super disappointment. I have had several models of O2Cool fans and this is by far the worst. First, it's noisy. Second, it doesn't keep the internal battery charged for very long. Third, if you are using solar power, it will NOT work with a modified sine wave power converter - it has to be a pure sine wave. My other two less expensive O2cool fans work fine with modified sine wave power. I will definitely not buy again. I have the base, medium and this model. To date, the middle option is the best. I'll try to post a video soon so you can hear how it works. Update: I bought this in May 2017, it's now September 2017 and it produces almost no flow, squeaks and is basically unusable. So get ready for the storm! I've tried my AC, GOAL ZERO YETI and MY Inverter and it's still a really lousy fan. I also noticed that they used cheap flimsy plastic for this model compared to their other models.