The Shure U4D-J4 dual wireless receiver operates on the J4 band with a frequency range of 554 - 584 MHz. Before buying, check your country's wireless frequency regulations as some frequency ranges may be illegal to use. Note that antennas are not included, but it comes with the correct power supply.

Using this Shure U4D - J4 dual wireless receiver is simple. First, connect it to the correct power supply that comes with it. Remember, you'll need to get your own antennas as they're not included. Before you start using it, make sure to check your country's wireless frequency laws. Using an illegal frequency range can get you in trouble. When it comes to maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or moisture. If you notice any issues, refer to the user manual or contact Shure's customer support.