The walkie-talkie earpiece is simply a wireless PTT (Push-to-Talk).
Frequency difference is an adjustment for the microphone, and it has nothing to do with the headphones.
Essentially, it involves separating the reception and transmission frequencies.
Pressing the transmit button corresponds to a specific frequency, while not pressing it corresponds to another frequency.
The PTT (Push-to-Talk) button indicates that I am about to transmit, but it does not have a function to change the frequency.
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