Package Contents: 1 Pack 201X(CF400X) Black Toner Cartridge. Compatible Printer Models: Color Pro M252n (B4A21A) printer Color Pro M252dw (B4A22A) printer Color Pro MFP M277n(B3Q10A) printer Color Pro MFP M274n(M6D61A) printer Color Pro MFP M277c6 (B3Q17A) printer Color Pro MFP M277dw (B3Q11A) printer Simple installation method: Step-1:Shake for 5 seconds to loosen toner powder distribution Step-2:Remove the seal tape from side of the toner Step-3:Remove orange rings from side of the toner Step-4:Insert the toner cartridge into your printer The latest upgraded chip: Adapt to the latest upgraded chips that can be quickly identified, ensure higher compatibility and provide a lasting printing experience with excellent performance! Printing Performance: Our 201A toner cartridges are made of high-quality carbon powder nano-level manufacturing process, with firm fixing, high blackness, non-toxic and harmless, bringing users a good experience. Aftersales and Warranty: If any of our items are defective, guaranteed money back; reach us via: 1. “Order List” -> Click “Contact Seller”. 2. Click the store name link under “Add to Cart”-> Click “Ask a question”.