Print More, Save More with RT TonerRT Compatible HP 78A CE278A Toner Cartridge• Quantity: 2 Black Toner Cartridge• Yield: 2.1k pages based on 5% coverage.• Compatible Printers: the RT compatible HP CE278A toner is designed for HP Laser Printers M1536dnf M1537dnf M1538dnf M1539dnf P1566 P1606dn.The Renewable Toner Advantage• Higher print quality. The RT compatible HP 78A Black toner cartridge is ISO 9001 and 14001 certified and tested to ensure superior performance. • Peace of Mind. You don’t need to worry about smudges, leaks, or defects. We offer a lifetime warranty and will replace any cartridge upon request. • Superior Support. We know printing is important - that's why we have a U.S. based customer support team. We are customer obsessed! It makes our day to make you smile. Contact us with any technical or product issues and we will be happy to assist you. • Earth Friendly. We promote a cleaner, greener future. Printing Tips • A common error is the “non-genuine” message. If this occurs with the RT compatible HP 78A CE278A cartridge, press OK or Continue repeatedly to dismiss the message. The printer will resume your print job.• Despite the extreme care we take in packaging, sometimes items are damaged during shipping and this can affect print quality. In this case, we immediately send an RT compatible HP 78A toner cartridge. If you order more than one cartridge, please test them all.Happy Printing!