MOSTOP&reg; Fashion Computer Vacuum Mini USB Keyboard Cleaner Desktop Laptop Brush Dust Cleaning Kit - Green Requires no external power source, plugs straight into any USB port. Suitable for computer keyboards, screens, mobile phones, cars and other equipment parts. Two vacuum cleaning attachments included one bristle brush attachment and one flexible rubber, computer keyboard tool attachment. Use the keyboard attachment rubber to vacuum the dust and other particles trapped underneath the keyboard keys, by sliding the squeezable tube between keys. Use the brush & suction tube attachment for general cleaning of air vents (fans); monitor and computer areas. Two switch levels: slide the switch to the first level to turn on the led light, slide the switch to the second level to turn on the vacuum cleaner.