General audio in the factory, the audio inside the will have a built-in wireless microphone board, there is a frequency above, the general square dance audio is a V-band frequency. Find the corresponding wireless microphone, you can frequency. Or the wireless microphone transmitter above the frequency tuned to the frequency band with the square dance audio above, you can complete the frequency pairing.
Secondly, the audio configuration of the wireless microphone where the battery is placed, there will also be a wireless frequency, you can find that frequency on the frequency.