This Sennheiser ew 300 IEM G3 wireless IEM system doesn't come with a power supply or batteries. It includes an SR 300 IEM G3 wireless stereo transmitter and an EK 300 IEM G3 wireless bodypack receiver. The frequency range is 566 - 608 MHz. Before buying, make sure to check your country's wireless frequency laws as some ranges may be illegal in certain countries. Also, the antenna for the transmitter is not included.

Using this Sennheiser ew 300 IEM G3 wireless IEM system is easy. First, you'll need to get your own power supply and batteries as they're not included. Connect the SR 300 IEM G3 wireless stereo transmitter to your audio source. Then, turn on the EK 300 IEM G3 wireless bodypack receiver. Remember to check your country's wireless frequency laws before using it to avoid any legal issues. When it comes to maintenance, keep the system clean and dry. Store it in a safe place when not in use. Also, handle the transmitter and receiver gently to prevent any damage.