Your evolution MOUSE-TRAK Trackball has been designed with user configurable features to improve your efficiency. When the user activates any key programmed for click and drag mode, the evolution MOUSE-TRAK will issue a series of short beeps (about one beep every four seconds) to inform the user that the evolution MOUSE-TRAK is in drag mode. This audio indication can be disabled by pressing buttons 2 and 5 simultaneously for 3 seconds.