Lexmark 64080HW. Black toner page yield: 21000 pages, Printing colors: BlackCompatible Printers: Lexmark T 642 DN, Lexmark T 640 DTN, Lexmark T 644 TN, Lexmark Optra T 644 DN, Unisys UDS 540-N 11, Lexmark Optra T 640 DN, Lexmark Optra T 640 TN, Unisys...