1. 【SMALL BUT POWERFUL】Each of our mini portable fans comes with a rechargeable battery that can run for up to 20 hours at the lowest speed. The highest speed reaches 6000 rpm for up to 6 hours, and the strong airflow ensures coolness for a long time. The battery life is three times longer than that of regular fans. 2. 【ELECTIVE AND FUNCTIONAL】With a detachable strap and foldable design, the mini portable fan can be transformed into a small USB desk fan or a hands - free hanging neck fan quickly. This rechargeable mini fan has a removable gold - plated front cover for easy cleaning. When dirt accumulates, it can be removed, washed, dried and then put back. 3. 【BRUSHLESS MOTOR & QUIET OPERATION】No one wants a distracting handheld fan. This portable handheld fan is powered by an energy - saving DC motor that operates at a noise level of 25dB, quiet enough to hear one's own breathing. The motor can be used for up to 20,000 hours. 4. 【VERSATILE & PORTABLE DESIGN】Our portable personal cooling fan is suitable for both indoor and outdoor use. It can be placed on the desk at work, taken on summer trips, or used to cool a baby while sleeping. With a convenient detachable neck strap, this portable neck fan can keep you cool even when you're on the move. Now you can deal with the heat hands - free!