Max 12 Hours Working Time: This portable handheld fan is up to 12 hours of cooling time on a single charge; 3-speed setting , you just need to press the power button to change the wind setting. Portable Neck Fan & Handheld Fans: Not only a handheld fan but also a portable neck fan with a removable lanyard. There is a built-in stand on the back, and after opening the stand, it works as a small desk fan. USB Rechargeable: The personal fan is USB rechargeable, it comes with a charging cable, you can charge it from a regular outlet, computer, or any other device via a USB port. A full charge takes 3 hours. Small Size: This small fan is only 4.8* 3.2* 1.6inch/0.3lb.