[Super Technology] This rechargeable fan is super quiet and super strong airflow. With special technology, which is quite quiet when working even at high speed when your child is sleeping or you are working. [Powerful Battery Capacity] This rechargeable fan comes with a 2400mAh battery that can even last up to 2-5 hours when fully charged. It's convenient to use the battery-powered fan so you never have to mess with cables or cords. [Long working time and USB rechargeable] This personal USB fan is powered by an upgraded rechargeable lithium polymer battery, which can be charged and discharged multiple times and supports a variety of power sources, such as common outlets, mobile power supplies and car chargers, computer or any device with USB port. [Flexible adjustment] The clamp fan has a flexible that can rotate 720 degrees. The portable rechargeable fan has 5 speed settings, so you can direct the air as you like.