Package includes: 1 x CF400A Black, 1 x CF401A Cyan, 1 x CF402A Yellow, 1 x CF403A Magenta.Page yield:Up to 1,500 pages per black toner cartridge and 1,400 pages per color toner cartridge at 5% coverage.*Tips: Please confirm your printer model#.Printer Compatibility : HP Color LaserJet Pro MFP M277dw PrinterHP Color LaserJet Pro MFP M277n PrinterHP Color LaserJet Pro MFP M277 PrinterHP Color LaserJet Pro MFP M277c6 PrinterHP Color LaserJet Pro M252dw PrinterHP Color LaserJet Pro M252n PrinterInstallation Instruction: 1. Before use, shake the new toner cartridge horizontally for several times to make sure the toner powder is well distributed. 2. Pull out the black paper cover out of the toner cartridge's body in the direction of the arrow shown. 3. Pull out the sealing tape at a slow and constant speed as to prevent the tape from breaking midway. 4. Carefully install the new toner cartridge into your printer and you are all set to print. How to contact us: Log in your amazon buyer account > Click Your Account > Your Orders > Find your order and click CONTACT SELLER, then we will give you a response as soon as possible.