The ZD421, built on Zebra's popular GK series, offers additional advanced features, flexibility, and security that ensure years of trouble-free printing. It is available in both thermal transfer and direct thermal models. The five LED indicators allow the user to quickly see what is needed to keep the printer operational, from media replenishment to troubleshooting printer issues. Advanced remote management capabilities help you optimize your printers, track and automate the reordering of supplies, and ensure security.