Samsung SL-M2875FD User Manual page 38

Media and tray
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.
Power voltage
110V Letter, Legal, US Folio, Oficio
220V A4
Available paper
2. Menu Overview and Basic Setup
37