HP 649X Black Dual Pack LaserJet Toner Cartridges. Page yield: 17000 pages, Print technology: Laser, Printing colours: Black. Operating relative humidity range: 20 - 80 %, Storage temperature range (T-T): -20 - 40 °C, Storage relative humidity range: 10 - 90 %. Package weight: 3700 g, Package dimensions (WxDxH): 394 x 326 x 219 mm, Weight: 2500 g