In order to use this feature the users just need to open up a presentation in Google Slides and go near to the Chromecast device and just simply hit the cast button. The smartphone or tablet of the user will act as a remote control at the time of streaming the content. It will let the users to advance the slides, view speaker notes and stay on track with the built in timer.
The iOS users will aslo be able to use the Chromecast for presentations as its app for iPhone and iPad supports AirPlay. Google rolled out a material design update to Google Slides last year.