? Pitney Bowes 797-0, 797-M, 797-Q New Compatible Red Fluorescent Ink Cartridge? Colors: Red, 2 Years Shelf Time, 800 Pages Yield Same as OEM? Compatible Printers: DM50/DM55/K700/K780002/K721/RK721? 1-Year 100% Quality Satisfaction Product Guarantee? 100% compatible with Pitney Bowes postage machines? 100% compatible with Pitney Bowes postage machines