Review on Stay Cool and Hands-Free with the Portable USB Rechargeable Waist Clip Fan – 8000mAh, 6-32 hours Working Fan Ideal for Travel, Outdoor, and Office by Jon Ford

I overheat pretty quickly, especially when I have to wear suits. This little miracle simply clips at the waist and can be tucked under a shirt. There are three settings - low, medium and high - for cooling. The specifications state that the battery lasts 32 hours. I haven't had a chance to test its durability yet, but I can say it will last at least a few hours at a time. I'm a big fan of the fact that it charges via USB-C. The fan is a little clunky, but it works well for me.