. This option allows printing on both sides of a page.
Supports A4, A5, JIS B5, Letter, Legal, Executive and Folio sizes. For use with all models (except dn) of the Lexmark T630, Lexmark T520 printers and the Lexmark X520, X630 MFPs, and Optra T610 and T612V printers. For use with (except d or dn) the Lexmark T520, T520n, T630, T630 VE, T630n, T630n VE, Optra T610, Optra T610n, Optra T612V, Optra T612Vn and Lexmark X520 MFP and X630 MFP.