Lexmark
56P1806
is compatible in the following Printer Models:
Lexmark Mono Laser
Optra T614 (4069-414)
Optra T614n (4069-41e)
Optra T614n (4069-41n)
Optra T616 (4069-616)
Optra T616n (4069-61n)
Lexmark MFP Options
Lexmark X7500 MFP Option (4036-501)