Samsung ML-4550 Mono Laser Printer, 1200 x 1200 DPI, A4, 43 ppm Samsung ML-4550 Mono Laser Printer. Number of print cartridges: 1. Maximum resolution: 1200 x 1200 DPI. Maximum ISO A-series paper size: A4. Print speed (black, normal quality, A4/US Letter): 43 ppm