ZEBRA GK420t Thermal Transfer Monochrome Desktop Label Printer, USB and Ethernet Port Connectivity to UseConnects via USB and Ethernet. Compatible with media rolls that have a 1-inch core, a maximum diameter of 5 inches, and a maximum width of 4.25 inches.Thermal Transfer TechnologyRequires a thermal ribbon for printing; also supports Direct Thermal technology, which does not require a ribbon but needs direct thermal media.Dependable PerformanceDesigned for durability and frequent use, capable of creating high-quality address, shipping, mailing, file folder, barcode, and binder labels, as well as name tags.Save Time and MoneyFeatures a maximum print speed of 5 inches per second, 203 dpi resolution, and is Energy Star approved for energy efficiency.