This Sennheiser ew 100 G2 beltpack wireless system operates at 626 - 662 MHz. It's designed for use outside the U.S. Before buying, check your country's wireless frequency regulations as some frequency ranges may be illegal in certain countries. The package includes a bodypack and a receiver, but no power supply or antenna. Note that the belt pack has tape on the back to hold the belt clip, and there's no power supply included.

Using this Sennheiser wireless system is easy. First, make sure you've checked your country's frequency laws. Since there's no power supply in the package, you'll need to get a suitable one. Connect the bodypack and receiver as per the basic wireless system setup. When using, keep in mind that the tape on the belt - pack back holds the belt clip, so don't remove it carelessly. As for maintenance, keep the system in a dry and clean place. After use, turn it off properly to save energy and prolong its lifespan. If you have any issues, refer to the Sennheiser general guidelines for wireless systems.