This Sennheiser wireless system operates at 626 - 662 MHz and is designed for use outside the U.S. Before buying, make sure to check your country's wireless frequency regulations as some frequency ranges may be illegal in certain countries. It comes with antennas, a receiver, and a transmitter, but no power supply.

To use this Sennheiser wireless system, first connect the antennas to the receiver and transmitter. Since it doesn't come with a power supply, you'll need to get a suitable one for the system to work. Before turning it on, double - check your country's wireless frequency laws to avoid any legal issues. When using, keep the transmitter and receiver within a reasonable distance for a stable signal. As for maintenance, store the system in a dry and cool place. Clean the antennas and the devices with a soft, dry cloth regularly. If you encounter any problems, refer to the Sennheiser official website for support.