The Zebra GK420t monochrome desktop direct thermal/thermal transfer label printer comes equipped with an Ethernet port, prints 5" per second at 203 dpi in a single color, and can be used to print labels, tags, receipts, or other media up to 4.09" wide. This middle level desktop printer can serve as a direct thermal printer, which heats thermal paper to produce the print, or as a thermal transfer printer, which heats a ribbon to produce the print on the paper. Direct thermal/thermal transfer printers use heat instead of ink and are typically smaller, quieter, faster, and more energy-efficient than dot-matrix printers. The GK420t has a maximum print speed of 5" per second at 203 dpi (dots per inch) and prints labels up to 39" long. The 32-bit processor combined with 8 MB of SDRAM memory and 4 MB of flash memory offers faster first label printing with extensive media graphics. The Ethernet port enables the printer to be connected to a wired computer network (Ethernet cord sold separately). A USB port and an included USB cable provide connectivity to a computer or another device. EPL and ZPL programming languages are standard.

The GK420t printer's double-walled casing is made of ABS (acrylonitrile butadiene styrene), which helps resist impact. An open-access design facilitates media loading. The printer automatically detects installed media and calibrates to the media type and length for accurate printing. A reflective sensor allows the printer to identify the gaps, holes, notches, or black marks between labels to print the labels accurately. A transmissive sensor enables it to detect when a roll of media has run out. An odometer can be used to track the print length. The auto-detectable power adapter can accept AC power between 100 and 240 volts. This product is suitable for use with black bar, black mark, continuous, continuous receipt, die-cut, fanfold, gap, notched, perforated, receipt, roll-fed, tag, or tag stock media (all sold separately). The maximum outside diameter for rolls is 5".