Air Circulator Fan Rechargeable Desk Fan Portable Oscillating Cordless Fan with LED Light 4 Speeds USB Powered Quiet Table Fan for Home Office Bedroom（4400mAh） Table intelligent oscillating fan：Specially designed with integrated turbine technology which can blow more concentrated and longer wind in a straight line so that can oscillating air circulation for the whole room. What’s more, it can be used both with an air conditioner in summer and a heater in winter to balance the whole room temperature quickly. 4 winds speed：4 modes (normal wind/ natural wind/ sleep wind/ baby wind) can be choose according to your preference, as our table fan equipped with a unique ventilation channel that can control the airflow and generate a stronger jet airflow with higher straightness. (Maximum Wind Speed: 16.4 ft/s ) Ultra quiet fan：The portable desk fan equipped with high performance motor produces powerful wind at a fairly low noise level (the maximum air volume 45 dB). Very quiet and it is ideal choice for slight sleeper use, also you don't need to worry about the wind blow sound will make noise while sleeping or working. 90 degree adjustable：The circulating fan can automatically rotate 90°for left and right. Even if it is placed in the corner or the center of the room, it can diffuse the air throughout the room, which is very convenient. You can also manually adjust the angle up and down by 90 degrees, and then blow the wind to the floor or ceiling. USB powered and 4400mAh capacity battery：USB circulating fan equipped with a high-performance DC motor, it can be charged conveniently with USB devices such as computer, laptop, car charger, power bank, and more USB enabled devices. Furthermore, it’s been designed for maximum energy-saving and power-saving, as it can be used continuously for about 6-20 hours after fully charged.