Logitech R400 Remote Presenter Setup on Mac and Troubleshooting on Mac - YouTube
StarTech.com Wireless Presentation Remote with Green Laser Pointer - 90 ft. (27 m) - USB Presentation Clicker for Mac and Windows - Batteries Included - Wireless Slideshow and Volume Controls
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Logitech R400 Wireless Presenter Remote Control
Logitech R400 presenter with Keynote on Mac works | Pim's Blog