The Shure U4D-J4 dual wireless receiver operates in the 554 - 584 MHz frequency range. Before buying, make sure to check your country's wireless frequency regulations as some frequency ranges may be illegal in certain countries. It comes with the correct power supply but no antenna.

Using the Shure U4D-J4 dual wireless receiver is easy. First, connect it to the correct power supply that comes with it. Since there's no antenna included, you'll need to attach your own antenna properly. Before using, always check your country's wireless frequency laws to avoid any legal issues. To maintain it well, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If you notice any problems, consult the user manual or contact Shure's customer support.