Features:Just connect the USB interface， easy to install and use.USB power， no external power required.2 kind of air speed can be adjustable， comfortable in use.Pitch angle can be adjusted upwards or downwards.Ultra-quite design， great for use in the office or other places in summer.Specifications:Material: ABS + PPInterface: USB 2.0Power Supply: DC 5V 500mAPackage List:1 * Mini Fan