Average Cartridge Yield 32,000 standard pages. Declared yield value in accordance with ISO/IEC 19752.nnThe Lexmark T644 print cartridges are designed for easy installation and quality performance to keep printers productive under heavier usage demands and to even further diminish per page costs. The T644 Extra High Yield Print Cartridge is not compatible with other Lexmark Printers including the Lexmark T640 or T642. nnFor use with Lexmark T644, T644n, T644tn, T644dtn Printers only. Not compatible with Lexmark T640, T640, T640dn, T640dtn and T642, T642n, T642tn, T642dtn printers.