Stay productive and keep your printer up and running smoothly with the HP LaserJet Toner Collection Unit. It is designed for use with HP Color LaserJet Enterprise M751dn, M751n, M856dn, M856x; Color LaserJet Enterprise M776dn; and Color LaserJet Enterprise Flow MFP M776z and M776zs. Replace the toner collection unit when the product control panel prompts you. Toner collection unit is designed for a single use. Capacity is 90,000 pages.