Save time money and paper when you use the HP two-sided printing accessory. The accessory prints both sides of the page automatically so you can concentrate on more important work. You?ll see budget savings because paper consumption is cut in half.Primary InformationProduct Type : Duplexer Compatibility : HP LaserJet 4250 Printer series HP LaserJet 4350 Printer series Special FeatureCOO : ChinaJapan TAA : Yes UNSPSC CodeUNSPSC Code : 44101700 Product IDUPC: 829160306100Manufacturer Part: Q2439B