The Zebra ZT421 is an industrial thermal transfer/direct thermal label printer built for heavy-duty, continuous label production, here in a 6-inch print width configuration at 300 dpi — suited to wider shipping labels, pallet tags, or compliance labeling than a narrower 4-inch model can handle. It includes serial, USB, 10/100 Ethernet, USB host, and Bluetooth 4.1 with MFi (Apple accessory certification) connectivity, and uses Zebra's EZPL printer language. Euro/UK power cords are included. Like the rest of Zebra's printers in this catalog, it's designed for warehouse, manufacturing, and distribution environments needing reliable, high-volume label output rather than light desktop printing.