| Colour | Y |
| Print technology | Laser |
| Duplex printing | Y |
| Maximum resolution | 2400 x 600 DPI |
| Print speed (black, normal quality, A4/US Letter) | 33 ppm |
| Print resolution colour | 2400 x 600 DPI |
| Print speed (colour, normal quality, A4/US Letter) | 33 ppm |
| Time to first page (black, normal) | 7.5 s |
| Time to first page (colour, normal) | 7.5 s |
| Print margins (top, bottom, right, left) | 4.2 mm |
| Maximum duty cycle | 85000 pages per month |
| Printing colours | Black, Cyan, Magenta, Yellow |
| Number of print cartridges | 4 |
| Page description languages | HTML Direct Image Space, PCL 5, PCL 6, PDF 1.7, PPDS, PostScript 3, XPS |
| Recommended duty cycle | 1500 - 8500 pages per month |
| Country of origin | China |
| Total number of input trays | 2 |
| Total input capacity | 250 sheets |
| Total output capacity | 125 sheets |
| Paper input type | Paper tray |
| Auto document feeder (ADF) input capacity | 250 sheets |
| Maximum number of input trays | 5 |
| Maximum input capacity | 1450 sheets |
| Maximum ISO A-series paper size | A4 |
| ISO A-series sizes (A0...A9) | A4, A5, A6 |
| Multi-purpose tray media types | Legal |
| Non-ISO print media sizes | Executive, Folio, Hagaki card, Oficio, Universal |
| JIS B-series sizes (B0...B9) | B5 |
| Envelopes sizes | 7 3/4, 9, 10, B5, C5, DL |
| Paper tray media weight | 90.3 - 105 g/m² |
| Direct printing | Y |
| USB port | Y |
| Standard interfaces | RJ-45, USB 2.0 |
| USB 2.0 ports quantity | 2 |
| USB connector | USB Type-A / USB Type-B |
| Wi-Fi | N |
| Ethernet LAN | Y |
| Cabling technology | 10/100/1000Base-T(X) |
| Ethernet LAN data rates | 10,100,1000 Mbit/s |
| Security algorithms | 802.1x RADIUS, IPSec, LEAP, MD5, MSCHAPv2, PEAP, SNMPv3, SSL/TLS, TTLS |
| Management protocols | DHCP, APIPA (AutoIP), mDNS, IGMP, Bonjour, WINS, DDNS, SNMPv3, SNMPv1, SNMPv2c, Telnet, NTP, ICMP, HTTP, DNS, ARP, HTTPs (SSL / TLS), Finger |
| Mobile printing technologies | Apple AirPrint |
| Internal memory | 1024 MB |
| Maximum internal memory | 1024 MB |
| Built-in processor | Y |
| Processor frequency | 1000 MHz |
| Processor cores | 2 |
| Sound pressure level (printing) | 50 dB |
| Sound pressure level (duplex printing) | 52 dB |
| Market positioning | Home & office |
| Product colour | Black, White |
| Built-in display | Y |
| Display | LCD |
| Colour display | Y |
| Display diagonal | 6.1 cm (2.4") |
| Touchscreen | N |
| Certification | ICES-003 Class B, BSMI Class B, VCCI Class B, US FDA, UL 60950-1, FCC Class B, cUL CAN/CSA-C22.2 60950-1, CB EN/IEC 60950-1, CB EN/IEC 60825-1, CE DoC (EN 62301 Class B, EN 62311, CE EN/IEC 60950-1, CE EN/IEC 60825-1, EN 61000-3, EN 55022 Class B, EN 55024, UL), EFTA (CE), KCC, CCC, CECP, CEL, C-tick DoC, UL-AR, KC mark, UL GS mark, UCRF, EC 1275 |
| Power consumption (printing) | 530 W |
| Power consumption (ready) | 37 W |
| Power consumption (standby) | 1.3 W |
| Power consumption (off) | 0.3 W |
| Energy Star Typical Electricity Consumption (TEC) | 1.4 kWh/week |
| Windows operating systems supported | Windows 10, Windows 7, Windows 7 x64, Windows 8, Windows 8 Pro x64, Windows 8.1, Windows 8.1 x64 |
| Mac operating systems supported | Mac OS X 10.10 Yosemite, Mac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.6 Snow Leopard, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks |
| Linux operating systems supported | Y |
| Server operating systems supported | Windows 2000 Server, Windows Server 2012 |
| Other operating systems supported | Novell Distributed Print Services (NDPS), Novell NetWare 5.x, Novell NetWare 6.x, Novell Open Enterprise Server 11, Novell Open Enterprise Server 2 |
| Operating temperature (T-T) | 10 - 32 °C |
| Operating relative humidity (H-H) | 8 - 80% |
| Operating altitude | 0 - 3048 m |
| Sustainability certificates | Blue Angel, EPEAT Silver, ENERGY STAR |
| Width | 442 mm |
| Depth | 421 mm |
| Height | 308 mm |
| Weight | 21 kg |
| Package width | 495 mm |
| Package depth | 595 mm |
| Package height | 402 mm |
| Package weight | 23.8 kg |
| Cartridge(s) included | Y |
| Included cartridge capacity (black) | 3000 pages |
| Included cartridge capacity (CMY) | 2000 pages |
| Power cord included | Y |
| Software CD | Y |
| Documentation CD | Y |
| Developer unit included | Y |
| Harmonized System (HS) code | 84433210 |
| Description |
| Lexmark CS521dn. Print technology: Laser, Colour. Number of print cartridges: 4, Maximum duty cycle: 85000 pages per month. Maximum resolution: 2400 x 600 DPI. Maximum ISO A-series paper size: A4. Print speed (black, normal quality, A4/US Letter): 33 ppm, Duplex printing. Display: LCD, Product colour: Black, White |
