Some advantages of this laser pointer include:
No need to share your screen, removing an extra step and avoiding browser access problems.
You can see your interlocutors while presenting your poster.
How to use the laser pointer
When you're a presenter and in a video conversation, click Enable laser pointer on the top right of your poster.
This will change your cursor into a red laser pointer.
Zoom in/out of your poster while pointing to certain sections.
Video example
Here's a video that shows how this works.