GX420d/t printers include a 4" (102mm) printhead, up to 6" (152mm) print speed per second, 203 dpi resolution(GX430t is 300 dpi), 5.0" (127mm) OD media capacity, serial, USB, parallel, and optional 10/100 Ethernet or wireless connectivity(with LCD) interfaces, Head-up sensor, 4MB Flash memory and 8MB SRAM memory standard, standard maximum label length of 39" (991mm).
Supports Line Mode (direct thermal only), ZebraDesigner label design software, and Windows drivers with every GK420 printer and ZPL/EPL programming Languages, (EPL-Eltron Programming Language, and ZPL - Zebra Programming Language).