Rechargeable Handheld Fan: Equipped with Type-C charging interface, built-in 3000mAh large capacity lithium battery, the USB mini fan can work for 4-10 hours after fully charged. Compatible with 5V output adapters, laptops, computers, power banks and other USB-enabled devices. The hand fan's USB output can also be used as a backup power supply in case of emergency. 4 Speeds Adjustable: The handheld fan supports easy one-click adjustment of 4 speeds : 1-3 speeds with crescendo, 4 speeds of circulating wind (the circulating wind automatically switches between the above 3 wind speeds to meet your different needs). Press and hold for 3 seconds to turn off. LED display: The foldable fan is equipped with a clear digital LED display, which can show you the precise battery level and current wind speed during work. It serves as a low battery reminder to remind you to charge this rechargeable fan in time. 180 Foldable Versatile Design: The handle of this portable fan can be folded 180 and the waist folded is only 9 x 8 x 4 cm. It can be used as a portable fan, neck fan (with cord), desk fan or cell phone holder; The multifunctional small fan is a good companion for cooling down while watching dramas, work, travel, sports, very suitable for hot summer days. Low noise: This usb fan Quiet is equipped with a high-speed brushless silent motor and 7 bionic gull wings, the lowest noise is only 30dB, which significantly reduces noise even at maximum wind speed; efficient power conversion of brushless motor can maximize power loss, resulting in significant energy saving and environmental protection.