The Zebra ZT421 is an industrial thermal transfer label printer, this configuration a 6-inch, 300 dpi model with UHF RFID encoding built in - used for printing and programming RFID-tagged labels for retail, logistics, and asset-tracking applications at industrial print volumes. Connectivity covers Serial, USB, 10/100 Ethernet, Bluetooth 4.1 with Apple's MFi certification (for reliable pairing with iOS devices), and a USB host port for connected peripherals like scanners. Like Zebra's other industrial printers in this range, it's built for continuous, high-volume label production in warehouses and distribution centres rather than occasional desktop printing, and ships with Euro and UK power cords.