All of the Optoma projectors I have ever installed use an IR emitter to sync the glasses to the projected image, so you'll need some DLP Link glasses. If the range of Optoma DLP Link glasses you might find on Amazon isn't quite enough choice then I recommend you have a look at posting your question on AV Forums in the projector users sub forum; perhaps there you'll find something different/cheaper. https://www.avforums.com/forums/projectors-screens-video-processors.43/ Good luck
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