4 Speed & Quiet Operation: Silent fan with 4 adjustable speeds, which can be adjusted according to your needs, just press the power button to change the speed. Desk fan is not only powerful but also quiet, you can barely hear it at the low speed, the working sound is lower than 40dB at the high speed, which will not disturb your sleep, work and study. Ideal for hot summer days, enjoy your cool summer. Large Capacity Battery & USB Rechargeable: USB fan built-in 4000mAh rechargeable batteries. Charging for 5 hours and it can work for 8-15 hours. Table fans with a 120cm USB cable, can be charged with a computer, mobile power, power bank and so on. Two Charging Interfaces: Micro USB and Type-C, make charging more convenient and faster. Multidirectional Rotatable: Desk fan can vertical rotatable 120 degrees, manually adjust up and down; horizontal rotatable 90 degrees, just press the "S" control. It is can easily change the wind direction to the desired area by simple rotational movements of the fan head. Detachable & Sturdy Base: The front cover of this fan is detachable, just turn it to the left forcefully, which is convenient for cleaning the fan. Four rubbers on the bottom of the pedestal help reduce vibration, which keeps the desk fan firmly to ensure doesn't slip over when working even at the high speed.