Portable ceiling fan are powered by USB, You can power it up through laptops、PC、USB chargers、 power bank 、USB wall charger (2A) and more. Note: Fan cannot be recharged，must be plugged into a power USB port to function，outdoor use requires carry it yourself power banks or USB power.Mini ceiling fan assembled after the size diameter is 16.5 inches，Equipped with USB extension cable with switch，Total length of the line 2.7 meters.The ceiling fan adopts a silent design, which will not interfere with work or sleep. With 6 leaves, good airflow of air and create a cool breeze, enjoying a comfortable summer.Small ceiling fan great for hot summer and windless day, For smaller space indoor outdoor RV dormitory bed room desk travel camping tent canopy cubicle etc.Easy to install and portable，It has 6 detachable leaves，Easy to install and disassemble，Small and lightweight, Disassemble it and put it into the backpack, occupying a small space.