This Sennheiser EM 100 G2 wireless receiver operates in the 740 - 776 MHz frequency range. Note that due to this specific frequency, it's not suitable for use in the US. Also, this unit doesn't come with a power supply. Before you buy, make sure to check your country's wireless frequency regulations as some frequency ranges may be illegal to use 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 easy. First, make sure you have a suitable power supply as it doesn't come with one. Connect the antennas properly to ensure a good signal. Remember, because of its 740 - 776 MHz frequency range, it can't be used in the US. Before using it in your country, check the local wireless frequency laws to avoid any legal issues. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or moisture. If you have any problems, you can always refer to the Sennheiser support team.