Adjustable to 4 speed levels: The USB fan has 4 adjustable speed levels: 1800 rpm breeze, 2100 rpm natural wind, 2500 rpm medium wind, 2800 rpm cooling air. 4 types of stunts can fully meet your needs in different situations. 5000 mAh battery. Rechargeable: The USB handheld fan is equipped with a 6000 mAh rechargeable battery and the battery can work for up to 16 hours. Level 1 (lowest level) fans support 16 hours of cooling time, Level 2 is 12 hours, Level 3 is 8 hours, and Level 4 is 4 to 6 hours. 180 degree foldable angle: Thanks to the foldable design, the fan can be adjusted to a 180 degree angle. Not only can it be used as a handheld fan, but also can be used as a table fan. You can adjust the angle as needed and enjoy the cool wind without worries. Power bank function: The battery can be used as a portable power bank. When you are traveling or taking a short trip, you can use the power bank to charge your mobile phone or laptop in an emergency. Easy to carry: The small USB handheld fan weighs only 220 grams and the foldable design takes up less space. Makes the fan portable and easy to carry in your bag. The handheld fan is the perfect companion for your hot summer days.