Zebra field upgradeable Ethernet module for the ZD411/ZD421 and ZD611/ZD621 series desktop printers. Compatible with the following Zebra Printers: ZD421D, ZD421T, ZD421C, ZD411D, ZD411T, ZD411D-HC, ZD611D, ZD611DHC, ZD611T. Important: This is not backwards
compatible with the ZD420 printers.