Toner collection unit is designed for use with HP Color LaserJet Printers CP3525n, CP3525dn, CP3525x, CM3530 MFP, CM3530fs MFP, M551n, M551dn, M551xh, M570dn MFP, M575dn MFP, M575f MFP & M575c MFP. Replace the toner collection unit when the product control panel prompts you. The toner collection unit is designed for a single use. Capacity is approximately 36,000 pages.