This Lexmark accessory is a dual paper tray module offering two separate 2500-sheet A4 trays (5000 sheets combined), designed to extend the paper capacity of compatible Lexmark MS911/MX91x-series laser printers. Fitting under the printer, it lets an office load two different paper stocks — such as plain and letterhead — at high volume, without needing to intervene as often as a standard single tray would require. As with similar Lexmark tray accessories, this is not a standalone product; it must be paired with a supported Lexmark printer body, and is aimed at busy, high-throughput print environments such as corporate print rooms rather than light home or small-office use.