HP 121A Yellow LaserJet Toner Cartridge. Page yield: 4000 pages, Print technology: Laser, Printing colours: Yellow. Operating relative humidity range: 20 - 80 %, Storage temperature range (T-T): -20 - 40 °C. Package weight: 0.9 kg, Package dimensions (WxDxH): 376 x 132 x 147 mm