Samsung ML-4551ND, Laser, 1200 x 1200 DPI, A4, 43 ppm, Duplex printing, Network ready Samsung ML-4551ND. Print technology: Laser. Number of print cartridges: 1, Maximum duty cycle: 200000 pages per month. Maximum resolution: 1200 x 1200 DPI. Maximum ISO A-series paper size: A4. Print speed (black, normal quality, A4/US Letter): 43 ppm, Duplex printing. Network ready, Wi-Fi