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The data on your PC screen can be easily sent by wireless transmission. And there is no need to switch cables each time the presenter changes. Multiple Transmission Mode allows data from multiple PCs to be shown on a single screen, or the data from one PC to be shown on up to 8 displays.
Wireless transmission is also possible from iOS devices. Simply install an application (free of charge) to display still-image slideshows and PDF images from an iPad™, iPhone®, etc.