How to Add Timings and Narration to a PowerPoint 2013 Presentation
Speak your narration into the microphone.
Press Enter or click the mouse button each time you want to advance to a new slide or call up a new animation element (such as a bullet point).
If you want to use the laser pointer on a slide, hold down the Ctrl key and then click and hold the mouse button and use the mouse to control the laser pointer.
When you release the mouse button, the laser pointer disappears.