Not unlike many people, I often do presentations and prefer to be able to control the slides without being tied to my computer.
There are many presentation remotes out there, however very few work seamlessly with Mac OSX or offer the features which the Logitech Spotlight does.
It is a little more expensive than others on the market, however if you do presentations regularly, or want something more professional, the for around the £60.00 you cant go wrong.
Here is a video I did for MacBites (https://macbites.co.uk), and you can pick your remote up from Amazon here: https://amzn.to/2WRdfbo