In this video tutorial, viewers learn how to flash the screen when receiving an alert in a Mac OS X computer. To turn on this option, go to the Universal Access window and select the Hearing tab. There will be 2 options for users to use. The first feature allows the user to flash the screen when an alert sound has occurred and the second feature allows users to stereo audio as mono. To test the flash the screen, click on Flash Screen. This video will benefit those viewer who use a Mac computer and would like to learn how to adjust some helpful hearing options because they have a hearing impairment.