Voice-activated function: by detecting the signal input from the microphone to turn on the transmitter, no need to press the PTT can be launched, suitable for both hands are not free when the situation, speak into the microphone to start the transmitter function so as to communicate directly with each other.

Voice detection is generally adjustable in several levels, the higher the level, the louder the volume needed to transmit, similarly, the lower the level, the smaller the sound can be transmitted, but prone to environmental noise interference and false transmissions, according to their own use of the environment and set the level of voice control.