This Sennheiser SR 300 IEM G3 wireless transmitter operates in the 566 - 608 MHz range. Note that it doesn't come with a power supply. Before buying, make sure to check your country's wireless frequency regulations as some ranges may be illegal in certain countries.

Using this Sennheiser SR 300 IEM G3 wireless transmitter is simple. First, connect it to your audio source. Since it doesn't have a power supply, you'll need to use your own compatible one. When using, always keep in mind the 566 - 608 MHz frequency range and check your local laws to avoid any legal issues. For maintenance, keep it in a dry and clean place. Wipe it gently with a soft cloth if it gets dirty. Don't expose it to extreme temperatures or humidity. This will help ensure it works well for a long time.