Nanotechnology miniaturizes normal objects, in this case, a guitar. It can be used to create tiny cameras, scales, and covert listening devices. An example of this is smart dust, which can be either a camera or a listening device smaller than a grain of sand. A nanometer is one-billionth of a meter. For comparison, a human hair is about 200,000 nanometers thick. The nano guitar is about as long as one-twentieth of the diameter of a human hair, 10 micrometers or 10,000 nanometers long. Each of the six strings is 50 nanometers wide. The entire guitar is the size of an average red blood cell. The guitar is carved from a grain of crystalline silicon by scanning a laser over a film called a resist. This technique is known as electron-beam lithography. 
The guitar strings can be made to vibrate by tiny lasers using an atomic force microscope, in the same way, a guitar player might use a plectrum. The strings vibrate at around 40 000 000 Hz, roughly 15 octaves higher than a normal guitar, which can typically reach up to 1318.510 Hz. Even if its sound were amplified, it could not be detected by the human ear.