Powerpoint presentation via direct wireless connection

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Hi guys, I hope someone can help me with this one.

I'm looking for a way to connect a laptop to a beamer via a "wireless" connection to be able to make presentations. At the moment we connect the laptops via VGA cable but as this is roughly 30 meters long the presentations are not very good quality.

The beamer has a DVI-D, a VGA and a USB type B connectors. I'm looking for something like a USB stick (inserted into the laptop) to transmit the presentation to the beamer somehow.

Just wondering if anyone has something similar. Thanks.