Long Working HoursThis battery operated fan fan is equipped with two 5200mAh batteries, so it can work between 10 to 40 hours depending on its speed (speed 1 last 40 hours; speed 2 last 18 hours; while, speed 3 last 10 hours). Three times longer battery life than the average ones. Strong AirflowIf you want to cool down quickly in summer, this powerful personal fan is your first choice. Speed 1 with 2400 RPM, speed 2 with 3100 RPM, speed 3 with 3600 RPM, has strong airflow to keep you cool. Foldable Design and Multi-functional The rechargeable USB fan can be adjusted from 0to 180 to satisfy your needs. In addition, it has a metal clip which can clip to seat, edge of the desk, umbrella, stroller, etc. It can be used as a handheld fan or desk fan. Multiple Power SuppliesThe ease of use is what we always brings to you. This handheld fan comes with several power supply options so you can use it on batteries or via USB by connecting to a computer, etc. You can even power the fan with a wall adapter. Lightweight and PortableThis 4 inches portable mini fan is only 0.9lb, you can fold it up and put it in your bag, it's easy to store and doesn't take up space, the key is that you can use it anywhere, especially suitable for shopping, outdoor sports or summer travel.