B6100DN - adds network card and duplex unit 64MB 25ppm 1200x1200dpi A4
OKI B6100DN 64MB 25ppm 1200x1200dpi A4, A4, 25 ppm
OKI B6100DN 64MB 25ppm 1200x1200dpi A4. Maximum ISO A-series paper size: A4. Print speed black (normal, A4/US Letter): 25 ppm