 For example, lights, lighted cables, displays, miniature disco balls, aquariums, terrariums, waterfalls, and pole dancers are all available in USB-powered versions.Arguably, there are many USB-based decorations embedded in existing products—keyboards with impractical backlighting (such as ones that only turn on while pressing a key, and ones that flash to the beat of a song), mice that (when the computer is turned off) turn on/off their light to a pre-programmed beat, or printers that show random quotations on LCD screens when not in use.A similar concept exists in the form of decorations that are powered by car adapter plugs.