This Sennheiser EM 100 G2 wireless receiver operates within the 740 - 776 MHz frequency range. Note that due to this frequency range, it's not suitable for use in the U.S. Also, it doesn't come with a power supply. Before you buy, make sure to check your country's wireless frequency regulations as some frequency ranges might be illegal in certain countries. This unit has only undergone a power - test. It includes antennas but no power supply.

Using this Sennheiser EM 100 G2 wireless receiver is simple. First, you'll need to connect your own power supply as it doesn't come with one. Then, tune it to the right frequency within the 740 - 776 MHz range. But remember, you can't use it in the U.S. due to the frequency. Before using it, always check your local wireless frequency laws. When it comes to maintenance, keep it in a dry and cool place. Don't expose it to extreme temperatures or humidity. If it gets dirty, use a soft, dry cloth to clean it. Regularly check the antennas for any signs of damage.