Compatible with: HP LaserJet M209dw, HP LaserJet M209dwe, HP LaserJet MFP M234dw, HP LaserJet MFP M234dwe Compatible Replacements Included: 2 HP 134X Black Toner Cartridges / HP W1340X Black Toner Cartridges / High Yield Working chip installed and ready to use! No manual transfer needed! Print as many pages as the OEM for a fraction of the cost! Page Yield* per Cartridge: 2,400 Average cartridge Page Yield* in accordance with ISO 19752. *at 5% coverage (ISO/IEC standard) Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.