For a fantastic toner cartridge that runs for longer in your Samsung ML-2850 series laser printer, choose a genuine Samsung Black Toner Cartridge (ML-D2850B/ELS). The red error light on your Samsung printer will flash when the toner cartridge is nearly exhausted, so make sure to order a replacement as soon as possible. When the light is solid red, the current cartridge is exhausted and must be replaced. This high capacity cartridge contains extra toner for a page yield of up to 5000 pages.