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The Brother MX-4000 is a 4 bin mailbox (output option) and can be attached to the HL-L6400DW/T. It has a capacity of 100 sheets x 4 bins and can be converted to 400 sheets x 2 bins.
This gives the HL-L6400DW and HL-L6400DWT a total output capacity of 1340 sheets.
| Brand | Brother |
| Colour | Grey |
| Form | Mail Sorter |
| Manufacturer | Brother |
| Type | Printer Upgrades |