Compatible with: Kyocera-Mita ECOSYS P3055dn Page Yield*: 21,000 per unit For best results, store in a cool, dry place. Use within 3 years of purchase for optimal performance. per unit. *at 5% coverage (ISO/IEC standard) Each cartridge is equipped with a brand new smart chip that accurately tracks your toner level Each cartridge is equipped with a brand new smart chip that accurately tracks your toner level Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.