Replacement PB-211 PB-211EV Toner CartridgeCompatible with Printers:P2500w PrinterP2502w PrinterM6550NW PrinterM6600NW PrinterM6552NW PrinterM6602NW PrinterPB 211 Toner Cartridge Installation Guide:Step-1 Gently shake the toner cartridge from side to side to distribute the toner evenly.Step-2 Pull out the orange sealing tabs on each side of the cartridge.Step-3 Remove the protective coverStep-4 Install the cartridge into the printer and power onWhat's in the box:( Total 1 Pack PB-211 Toner Cartridge )1 x Pack PB-211(PB211) Black Toner CartridgeNotice:Please confirm your printer model before you use .?How to Get After-sales ServiceClick our product pages in your order history, Sign into your Amazon account and found our seller name on the top of the product page(below the price),and then found out "Ask a question", then send an email to tell us your issues (including invoice request).