*USB or Rechargeable Battery Operated - The clip-on fan has a 2000 mAh battery that can last from 2.5/4.5/9 hours(Depending on speeds). The clip fan can be used while charging. It is convenient for bedrooms, desktops, strollers, camping, car seat, and travel. *Strong Wind & Low Noise - This stroller desk fan built-in brushless motor, which is powerful and has a long service life. Our fan blades and fans cover has been upgraded according to the principle of aerodynamics. *The fan can support powerful airflow but also makes the fan operate quietly, it will not disturb you at all when you are working or sleeping. * Easy-to-open clamp, which can clip on a thing of thickness within 1 inch. *Mini Size with Rotation Design - 360° of horizontal rotation and 360° of vertical rotation, this mini fan is only 5.11*1.54*6.77inch and 0.71lb.