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http://www.matrox.com/graphics/en/corpo/products/extio/extiof1240.php

Multi-display Remote Graphics Units (RGUs)
The Matrox Extio™ F1240 multi-display Remote Graphics Unit enables the extension of two dual-link video displays, audio and six USB devices, such as keyboard and mouse, by up to 820 feet (250 meters) via a single fiber-optic cable. Designed with passive (fanless) cooling, the Extio 1240 provides a quiet, secure and high reliability environment that delivers uncompromising image quality and performance. Ideal for professional and mission critical environments, the Extio series of products achieve an experience that parallels having the computer situated at the users’ desk.