Product Name: Smart Gadget Compatible Brother TN770 Toner Cartridge Package Contents: 2 x TN770 Black Toner Cartridge High Page Yield: Up to 4,500 pages per TN770 Black Cartridge (5% coverage) Compatible for: Brother HL-L2370DW HL-L2370DW XL MFC-L2750DW MFC-L2750DW XL Printers ADVICE: If you are not sure which toner, ink or drum unit cartridge the printer requires, please check the label of your old unit cartridge. It will help you see the correct required cartridge model. WARRANTY: 30 days for a refund or replacement from the date of purchase ? If you have any questions or concerns please do not hesitate and send us an email. A customer service representative will gladly assist you. ? The use of compatible or replacement cartridge supplies does not void your printer’s warranty.