The 640 Series offers three different models to suit particular needs and applications. The FD 642 is a modular two station model which incorporates all of the Series' advanced standard features. The FD 644 provides a higher level of flexibility with four standard feed stations. The ultimate level in flexibility is available with the FD 646 folder/inserter. This model includes three standard feeders and one special feeder designed to handle glossy or heavier documents. All three models deliver high-end productivity while maintaining easy to use features such as AutoSet, drop-in feed systems and a sleek compact design.