Compact USB Fan: This is a compact mini size desk fan, the diameter of the blades is 4 inch, and the exterior frame is 6inch. With a 3.6ft / 1.1meters 5V/1A USB cable behind the table fan, it can get accessed to USB interface like adapter, USB hub, power bank, PC/laptop. | Super Quiet: Even running in the strongest mode, the noise of the USB fan is still less than 40dB, let you feel comfortable and cool anytime but won't bother you when sleeping, studying or working. | 2 Speed Settings: You can press the button behind the portable fan to choose the preferred wind speed, and enjoy breeze all the summer with the company of the personal fan . | 360Deg' Free Rotation: The head of the small fan could be 360Deg'rotatable, which is a considerate design for much wider blowing range to help you enjoy the cool wind anywhere at home,office, near desk table sofa bed. | Exquisite Appearance: The exterior frame is made of iron, and the blades are made of aluminum, looking metallic and textured. The metal mini fan is more refined in appearance than plastic fan, and heavier in hand, and there are 3 silicone anti-slip rings under the base to provide stable support. | voltage: 5.0 volts