General description This portable mini fan is a USB rechargeable device featuring a high-capacity 4000mAh lithium battery, allowing it to operate for 5.5 to 13 hours on a full charge. It is designed for versatility, making it suitable for various occasions, whether you need a handheld fan, a neck fan, or a desk fan. Technical specifications Battery capacity: 4000mAh Operating time: 5.5 to 13 hours Weight: 190g Usage Five adjustable air speeds to meet different cooling needs Single-touch design for easy speed adjustment and power off LED display indicating current air speed and battery level Removable fan cover for easy cleaning Low noise operation due to high-quality pure copper motor Other information Compatible with all USB ports for charging