Simple connect the Vacuum to the USB port of your laptop or PC computer. No need external power source, just plugs straight into any USB port. * Two Vacuum cleaning attachments included - one bristle brush and another flexible rubber. Use the keyboard attachment rubber to vacuum the dust and other particles trapped underneath the keyboard keys, by sliding the 7 Great for travel. * Convenient, compact & easy to use * It is great for the keyboard, printer, camera equipment, audio-visual equipment and office electronic equipment * It is also designed for vacuuming heavier dirt and dust