MM Black Laser Toner - HP 51A (Q7551A) - For HP LaserJet. Page yield: 6500 pages, Print technology: Laser, Printing colours: Black. Operating temperature range (T-T): 10 - 32.5 °C, Operating relative humidity range: 20 - 80 %, Storage temperature range (T-T): -20 - 40 °C. Weight: 1.62 kg