The best-in-class enhanced GX420t thermal transfer printer offers the widest range of features, and fast 6 inches per second print speed to meet all your low- to medium-volume printing requirements. The GX420t has a sleek and compact design, boasts the easiest ribbon loading system on the market, and supports a variety of applications and industries. The printer combines an intuitive design and optional LCD user interface with ultra-fast print speeds and versatile. Print Width: 4. 09\"/104 mm Print Resolution: 203 dpi/8 dots per mm Maximum Print Speed: 6\"/152 mm per second (203 dpi) RS-232 auto-sensing serial interface, DB-9 USB V1. 1, bi-directional Centronics Parallel Ethernet - 10/100 internal (optional) offered in combination with USB and Serial interface (replaces Parallel port) Wireless - 802. 11b/g or Bluetooth 2. 0 (optional) with LCD display offered in combination with USB and Serial interaces (replaces Parallel port)