The Sennheiser EM 100 G1 wireless receiver operates in the 630 - 662 MHz frequency range. Before buying, make sure to check your country's wireless frequency regulations as some frequency ranges may be illegal in certain countries. This receiver comes without a power supply and antennas.

To use the Sennheiser EM 100 wireless receiver, first, you need to get a compatible power supply and antennas as they are not included. Connect the power supply to the receiver and attach the antennas properly. When using it, always check your local wireless frequency laws to avoid any legal issues. For maintenance, keep the receiver in a dry and clean place. Regularly check the connections to ensure they are secure. If you encounter any problems, refer to the official Sennheiser support for help.