This Sennheiser EM 500 G3 wireless receiver operates in the 516 - 558 MHz frequency range. Before buying, make sure to check your country's wireless frequency regulations as some ranges may be illegal in certain countries. It has a software revision of 1.7.7 and comes with the correct power supply but no antennas.

Using this Sennheiser EM 500 G3 wireless receiver is straightforward. First, connect it to the correct power supply that comes with it. Since it doesn't include antennas, you'll need to attach your own suitable antennas. Before you start using it, always check your country's wireless frequency laws. Make sure the frequency range of 516 - 558 MHz is legal for use in your area. For maintenance, keep it in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. If you face any issues, you can refer to the software revision 1.7.7 details to see if an update might solve the problem.