USB Desk Fan, 4 Inch Portable Ultra-Quiet Mini Fan, 360 Up and Down, Three-Speed Wind, Suitable for Office, Family (Blue) 122*122*35mm Portable mini fan, USB powered and 3-speed settings, it can be powered by computers, adapters and other devices with USB interface, three adjustable wind speeds, low, medium and high, you can choose your favorite wind speed. This mini fan is an ultra-quiet fan, ideal for use in quiet environments such as offices, homes, libraries, dormitories, etc. You will only feel the cool breeze and will not hear the noise. 360 rotation, you can tilt it to your satisfaction angle, with two non-slip bases on the bottom, you can put the fan firmly on the table, don't worry that it will fall down.