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Keyscan door control units are built for longevity, durability and reliability. Engineered by Keyscan, all 2, 4, and 8 door control units are designed for fast and efficient performance with standard features like dual on-board processors and heavy duty relays. Keyscan controllers are built for maximum flexibility and limitless expandability. And they're all backed with Keyscan's legendary customer service and technical support.