HP LaserJet Enterprise 500 color M551dn, LaserJet. Maximum resolution: 1200 x 1200 DPI, Print technology: Laser, Maximum duty cycle: 75000 pages per month. Print speed (black, normal quality, A4/US Letter): 32 ppm, Print speed (colour, normal quality, A4/US Letter): 32 ppm, Time to first page (black, normal): 11 s. Internal memory: 1024 MB, Maximum internal memory: 1024 MB. Processor clock speed: 800 MHz, Built-in processor: ARM Cortex-A8. Standard input capacity: 600 sheets