EASY TO USE: Connects via USB port or ethernet port and is compatible with thermal transfer label rolls with 1 in core, max diameter of 5 in, and max media width of 4.25 inNO INK OR TONER: Prints using thermal transfer technology which uses a wax/resin ribbon instead of expensive ink or tonerDEPENDABLE PERFORMANCE: Enterprise grade quality designed for durability and frequent use, the GK420t can create high quality address, shipping, mailing, file folder, barcode, and binder labels as well as name tagsSAVE TIME AND MONEY: Prints 5 in/sec at 203 dpi, Energy Star approved, and on demand printing allows you to print exact quantities instead of wasting 8.5 x 11 sheets of labelsMAC AND PC: For use with Windows 10 and above, Mac OS X 10.6 Snow Leopard and above, and Linux systems using current CUPS printer drivers