Optional Lower Paper Tray (520-sheet capacity). Maximum capacity based on using 20 lb. paper. Add the LT-6505 to a compatible model for printing mixed paper size documents such as letter / legal, letterhead, and colored paper. Add up to two optional LT-6505 trays to the HL-L5210DN, HL-L5210DW, HL-L6210DW, HL-L6217DW, HL-L6310DW, HL-L6400DW, HL-L6400DWG, HL-L6400DWX, HL-L6415DW, HL-EX415DW, DCP-L5510DN, MFC-L5710DN, MFC-L5710DW, MFC-L5715DW, MFC-L5717DW, MFC-L5915DW, MFC-L6750DW, MFC-L6810DW, MFC-L6900DW, MFC-L6900DWG, MFC-L6900DWX, MFC-L6915DW, MFC-EX915DW. Add one optional LT-6505 tray to the HL-L5210DWT, HL-L6210DWT, HL-L6400DWT, and HL-L6415DWT.