The blue lights located at the top right of the keyboard indicate the following:mouse — Wireless mouse. For more information, see Using the Keyboard and Mouse.media control buttons — Control playback of media.Turns on steadily or blinks to indicate keyboard battery charge status.Turns on when the numeric keypad is enabled.Turns on when the uppercase letter function is enabled.Turns on when the scroll lock function is enabled.Press to open or close the optical drive. If media is present in the closed drive, pressing this button will open the drive and eject the media.Press once to go back to the start of the current playing track/chapter. Press multiple times to skip back to previous track/chapters. Press and hold torewind within the current track/chapter.Press to stop media playback.Press once to skip forward one track/chapter. Press multiple times to skip forward multiple tracks/chapters. Press and hold to fast-forward within thecurrent track/chapter.Press to either play or pause the media.Press to turn off the volume of audio output from internal or external speakers.Press to decrease the volume of audio output from internal or external speakers.Press to increase the volume of audio output from internal or external speakers.