Lexmark
40X5550
is compatible in the following Printer Models:
Lexmark Mono Laser
Lexmark T650dn (4062-01A)
Lexmark T650dtn (4062-01A)
Lexmark T650n (4062-01A)
Lexmark T652n (4062-21A)
Lexmark T652dn (4062-23A)
Lexmark T652dtn (4062-23A)
Lexmark T654n (4062-41A)
Lexmark T654dn (4062-43A)
Lexmark T654dtn (4062-43A)