P3100DN Monochrome Laser Printer Print Only Print Speed: 31ppm Connection: USB + LAN Toner Cartridge: 3500 Sheets Print Resolution: 1200 * 1200dpi Additional Function: Duplex Print M3100DN Monochrome Laser Printer Print, Copy, Scan Print Speed: 31ppm Toner Cartridge: 3500 Sheets Connection: USB+LAN Print Resolution: 1200 * 1200dpi Additional Function: Duplex Print