I bought this keyboard only to its primary function very useful: the button illumination. This lighting is red and can be modulated: 2 intensities or even cut completely. The higher intensity do not mind in complete darkness and can be controlled by pressing a button on the keyboard. In addition to the light intensity button, there are 3 buttons: volume less, more volume, cut volume. Also very helpful. Below the keyboard there are "skates" slip useful on a table for example waxed. The keyboard does not move. Quality keyboard. Delivery nickel as usual. Very good buy, I recommend at this price.