PiloTone is a squelch circuit function.

It was designed by one of MIPRO's R&D senior engineers. The main function of the PiloTone is to prevent unwanted signal and sudden bursting noise interference when the receiver is at stand-by mode. With PiloTone, both the microphone and receiver are equipped with built-in sub audible modulation signals. The receiver tone squelch opens only when receiving a signal containing a matching sub audible tone. Thus, it prevents other signals or noises from interfering. As such, another non-PiloTone system with the same frequency will be unable to open the PiloTone receiver. However, a PiloTone microphone can open a non-PiloTone system, but it will generate a high pitch noise.

The PiloTone design is quite sophisticated. Only higher quality systems are equipped with this advanced function.