This Sennheiser EM 100 G2 wireless receiver operates in the 518 - 554 MHz range. 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 in certain countries.

Using this Sennheiser EM 100 G2 wireless receiver is easy. First, make sure you have a proper power supply as it's not included. Connect the receiver to your audio system. You'll also need to get suitable antennas separately. Before using, check your country's rules on wireless frequencies to avoid any legal issues. When it comes to maintenance, keep it in a dry and clean place. Regularly check the connections to ensure good performance. If you notice any problems, don't try to fix it yourself but contact a professional.