Samsung SL-M2625D-XAA - Manual (Page 27)

Media and tray
27 2. Basic Setup
Paper quantity indicator shows the amount of paper in the tray.
1 Full
2 Empty
Paper type available for duplex printing
Duplex printing might not be available for some models (see "Features by
models" on page 6).
Depending on the power voltage your machine uses, available paper types for
duplex printing differs. Refer to the below table.
1 2
Power voltage Available paper
110V Letter, Legal, US Folio, Oficio
220V A4