You need a reliable printer that delivers quality performance, now and for years to come. The ZD421 offers new, advanced features that make it stand apart. It includes a new, more intuitive user interface, powerful architecture and field-upgradable wireless kit. It is available in direct thermal, thermal transfer, healthcare and ribbon cartridge models. The ZD421 is engineered to power future printing and in comparison, it's 30% more powerful than the ZD420 Series and 700% more than the GK Series.