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Can I plug it into an LCD projector and then wirelessly stream my presentation (keynote, PowerPoint, PDF) or even screen mirror, from my laptop? Would be great for presentations.

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It just plugs straight into the HDMI port, so I don't see why not. Before the presentation started you'd need to set it up on the local wi-fi however.

And hope no-one in the audience has videos of their own that they want to share.

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