The mini size is easy to clean the dirt at the corner of the keyboard. It is also designed for vacuuming heavier dirt and dust. Simply connect the vacuum to the USB port of your laptop or computer. It can keep your keyboard clean with this portable vacuum cleaner. This keyboard vacuum cleaner can be plugged straight into USB port without requiring external power source. A great accessory for the keyboard, printer, camera equipment, audio-visual equipment and office electronic equipment.