Page Yield*: 400 For best results, store in a cool, dry place. Use within 18 months of purchase for optimal performance.*at 5% coverage (ISO/IEC standard) The ink monitoring chip on this compatible remanufactured Epson T048520 is the original chip which has been reset to provide accurate ink monitoring Compatible with the following Epson Stylus Photo printers: R200, R220, R300, R300M, R320, R340, RX500, RX600, and RX620 Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.