From the manufacturer
This cartridge works with: HP LaserJet 4345 MFP, 4345x MFP, 4345xm MFP, 4345xs MFP; HP LaserJet M4345 MFP, M4345x MFP, M4345xs MFP
Cartridge yield (approx.): 18,000 pages
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What’s in the box: 1 new Original HP 45A Black Toner Cartridge (Q5945A)