This Sennheiser EM 500 G3 wireless receiver operates in the 516 - 558 MHz range. Note that it doesn't come with a power supply or antennas. Before you buy, make sure to check your country's wireless frequency regulations as some ranges may be illegal in certain countries.

Using this Sennheiser EM 500 G3 wireless receiver is simple. First, you'll need to get a suitable power supply as it's not included. Connect your devices to the receiver. Remember to check your country's wireless frequency laws before using it to avoid any legal issues. As for maintenance, keep it in a dry and clean place. Regularly check the connections to ensure a stable signal. And don't forget that this unit doesn't have antennas, so you'll need to get your own if required.