Samsung ML-1660, Laser, 600 x 1200 DPI, A4, 16 ppm, Duplex printing Samsung ML-1660. Print technology: Laser. Maximum duty cycle: 5000 pages per month. Maximum resolution: 600 x 1200 DPI. Maximum ISO A-series paper size: A4. Print speed (black, normal quality, A4/US Letter): 16 ppm, Duplex printing