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. So this 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 Strong and Durable Clip - This personal fan comes equipped easy-to-open clamp, which can clip on a thing of thickness within 1 inch. Moreover, The inner side of the clip is equipped with a sponge pad that will not cause scratches Mini Size with Rotation Design - 360 of horizontal rotation and 360 of vertical rotation, You can always find your favorite angle to enjoy the comfort of the wind. The mini fan is Not only easy to carry but also saves space