The HP 154X Black Original LaserJet Tank Toner Reload Kit (W1540X) refills the built-in toner tank of HP LaserJet Tank printers instead of replacing a whole cartridge. It is compatible with the HP LaserJet Tank 1502 and 2502 and the LaserJet Tank MFP 1602 and 2602. The kit is a high-yield reload rated by HP at approximately 5,000 pages, and HP says the reload takes about 15 seconds with no mess. This design is aimed at home offices and small businesses that print a lot of black-and-white pages and want a very low cost per page. According to HP, the box contains the toner reload kit, a recycling guide, a setup guide and a warranty flyer. Yield varies with page content.