OKI B412DN A4 Mono Printer The compact design of the B412dn brings fast, high quality black and white printing to the desktop of even the most cost conscious user. This high performance printer delivers documents fast and incorporates many time and money saving features including a high capacity toner option to keep running costs low. Ultrareliable digital LED technology and the peace of mind of OKI Europeís industry leading three-year warranty means there is no need to compromise.