The Okidata ES7131, B721 and B731 monochrome laser printers have OEM-rated print speeds from 49 to 55 pages per minute (ppm) and duty cycles of up to 280,000 pages per month.
The supplies set includes one toner cartridge and a separate drum unit. Replacement toner cartridges are available in yields of 18,000, 25,000 and 36,000 pages, although not all printer models use all three yield cartridge versions.
Printers ship with a starter toner cartridge yielding either 10,000 pages (B721, B731) or 36,000 pages (ES7131). All toner cartridges require a chip for correct printer operation.