Oki MC160MFP - Tray 2 (Lower Feeder Unit); Kit Contents

249 Installing Accessories
Tray 2 (Lower Feeder Unit)
You can install up to one optional lower feeder unit (Tray 2). The lower feeder
unit increases your machine’s media feed capacity by 500 sheets.
Kit Contents
 Lower feeder unit with a tray (500-sheet capacity)