Brother TJ-4021TN Industrial Label Printer is a label printer that supports both direct thermal and thermal transfer printing. It features a maximum print speed of up to 254 mm/sec and a resolution of 203 dpi. The printer is designed for roll media with a maximum size of 12 cm and a minimum customized media size of 20 mm, adjustable up to 120 mm.

Weighing 9.4 kg, the printer offers multiple connectivity options including USB 2.0, LAN, serial, and USB host. It comes with 128 MB of installed RAM and 128 MB of flash memory. The display size is 8.9 cm (3.5").

Supported printer languages include ZPL II, EPL2, and DPL. It can print various barcode formats such as Code 93, Industrial 2 of 5, Code 39, Code 49, CODABLOCK, GS1 DataBar, QR Code, MaxiCode, Aztec Code, Telepen, LOGMARS, UPC-A, UPC-E, and MicroPDF417.