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The VSA's appeared in "Abridging the Devil's Divide". Vocal to sub-audio. Wired to the ossicles. An earphone connected to the ear bones. Nobody can hear but you. Harper and Dylan Hunt used these to communicate during the time they were captured by the Patriarch. Harper would cough to alert Dylan. "Cough once for No and twice for Yes"


Harper references this technology in "Harper 2.0" when he is in possession of the All Systems Library. "He must've used some kind of pulse signal. A modified sub-vocal transmitter."