This Sennheiser EM 100 G3 wireless receiver operates in the 626 - 668 MHz frequency range. But note, it doesn't come with a power supply or antennas. Due to its frequency range, it's not legal for use in the U.S. Before you buy, make sure to check your country's wireless frequency regulations as some ranges are illegal depending on the country. This unit has only been power - tested.

Using this Sennheiser EM 100 G3 wireless receiver is simple. First, you'll need to get your own power supply and antennas as they're not included. Connect the power supply and antennas properly to start using it. However, before you do, remember to check your country's wireless frequency laws. This is really important because using it in an illegal frequency range can get you in trouble. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If you notice any issues, it was only power - tested before, so you might want to have it checked by a professional.