Easy to use: connects via usb, serial, or ethernet and is compatible with thermal transfer rolls with a 3 in core and 8 in diameter use with thermal ribbon: prints using thermal transfer technology which uses a wax/resin ribbon instead of expensive ink or toner enterprise grade quality: sturdy, simple and smart, the zt411 is ideal for manufacturing, transportation, healthcare and retail save time and money: prints 14 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 labels sturdy construction: equipped with a metal frame and a bi-fold metal media cover with an enlarged clear viewing window