Workforce Pro C-Series Paper Tray. An optional second tray adds 250 sheets and increases the printer's maximum input capacity to 580 sheets. Users can set the print option to "auto select" and the printer will automatically select papers from the 2nd tray when 1st tray is empty. Compatible products WP-4010, WP-4023, WP-4090, WP-4520, WP-4533, WP-4590.