The Sennheiser EM 100 G1 wireless receiver operates in the 630 - 662 MHz frequency range. Note that it's not for use in the U.S. Before buying, make sure to check your country's wireless frequency laws. Some frequency ranges may be illegal in certain countries. This receiver comes without a power supply and antennas. It has only been power - tested, so remember it doesn't include these essential parts.

Using this Sennheiser EM 100 wireless receiver is easy. First, you'll need to get a suitable power supply and antennas as they're not included. Connect the power supply to the receiver and attach the antennas properly. Before turning it on, double - check your country's wireless frequency regulations to ensure you're using it legally. When you're using it, keep it in a stable place away from strong electromagnetic interference. For maintenance, clean the exterior of the receiver regularly with a soft, dry cloth. Don't expose it to extreme temperatures or moisture. If you encounter any issues, refer to the Sennheiser official website or contact their customer service.