The Zebra GX420D Thermal Label Printer is a monochrome label printer that supports 8-bit grayscale and 12-bit color depth. It has a maximum resolution of 203 x 203 DPI and a black print speed of 6 ppm. The printer has a memory of 8 MB and supports various paper sizes such as 4" x 6", 4", 4" x 2", and 4" x 4". It is a portable and networkable printer that can be connected via cable, serial, parallel, USB, or Ethernet.