Such tool can be useful for specific time of your presentation. It may help change the rhythm
of your presentation flow and help you give a short rest!  Be careful with effects as what counts
is that the audience remembers you and your speech.

1.  Click on the tab Animations in the Ribbon
2.  Select the slide on which to apply the automatic transition
3.  Check “Automatically After” on the right hand side and input how many minutes when
PowerPoint will move to the next slides.
4. You can also change the transition style and add sound for transition