Large Battery Capacity: The portable fan has a large battery capacity of 4000mAh, providing 3-10 hours of working time on a full charge in only 7-8 hours of charging time, which is enough for a one-time use all day. You can easily charge it via USB power adapter or computer. (Working time varies according to wind speed ratio.) Remote Control & LED Lights: Compared with traditional fans, our portable fan has a wireless remote control, so you don't need to get up or stretch your arms to adjust the fan, so convenient for busy hands. Built-in 4 LED lights, safe and comfortable on hot nights. Quiet & 3 Wind Speeds: There are 3 wind speeds available to meet your different cooling needs on hot days and nights. (Low-Strong-Natural Wind). It features an upgraded brushless motor, quiet, small fan blades circulate with powerful airflow wherever you want, produce low noise (at least 30dB), effectively reduce the impact of fan usage on your sleep. Detachable and Small Footprint: Design of blades