Based on this product's specifications, here are some alternatives and similar models
WLAN interface module for Zebra label printers — compatible with ZD421D ZD621D ZD421T ZD411D ZD411T ZD611D ZD611T
Summary description:
WLAN interface module (wireless Wi‑Fi kit) for Zebra label printers. Provides wireless network connectivity for compatible Zebra models ZD421D, ZD621D, ZD421T, ZD411D, ZD411T, ZD611D and ZD611T. Supplied as a single spare part (1 pc) to enable Wi‑Fi printing and remote management in retail, logistics, manufacturing and office environments.