This Shure SLX4 wireless receiver operates on the L4 band from 638 to 662 MHz. Note that it doesn't come with a power supply or antennas. Before buying, check your country's wireless frequency regulations as some frequency ranges may be illegal for use in certain countries.

Using this Shure SLX4 wireless receiver is easy. First, make sure you've got a suitable power supply since it's not included. Connect your audio device to the receiver. Then, set the frequency within the 638 - 662 MHz range, but remember to check your local laws before using. As for antennas, you'll need to get your own and attach them properly. When it comes to maintenance, keep the receiver in a dry and clean place. Don't expose it to extreme temperatures or moisture. Regularly check the connections to ensure a stable signal.