Laser Tek Services Compatible Toner Cartridge Replacement for the HP Q5942X. (Black, 1-Pack) Package Contains 1 Black Q5942X (42X) Compatible Replacement Toner Cartridge For use in the following printer models: HP LaserJet 4250, 4250dtn, 4250dtnsl, 4250n, 4250tn, 4350, 4350dtn, 4350dtnsl, 4350n, 4350tn. (The 5942X does not work in the LaserJet 4240/4240n. Use a 5942A instead, for those printer models.) Page Yield: 20,000 pages @ 5% page coverage Product Comes with a 1 year 100% Satisfaction Guarantee! Laser Tek Services offers free technical support for any questions you may have. Manufactured by ISO and STMC certified facility.| The Use of Laser Tek Services compatible products will not void your printers warranty.