This Shure SLX4 wireless receiver operates on the L4 band, with a frequency range of 638 - 662 MHz. Note that it doesn't come with a power supply or antennas. Due to the frequency range, it's not legal for use in the U.S. Before buying, check your country's wireless frequency laws. Different countries may have restrictions on certain frequency ranges.

Using this Shure SLX4 wireless receiver is simple. First, you'll need to get a suitable power supply as it doesn't come with one. Also, you'll have to connect your own antennas. When using it, always check your local laws about wireless frequencies to make sure you're on the right side of the law. To keep it in good shape, store it in a dry and cool place. Avoid exposing it to extreme temperatures or moisture. If you notice any problems, have it checked by a professional.