There’s a continuity issue here: In Opps1, Ch.6, Pg.21 we showed Kyan talking into a mic in her collar but that was a miscommunication between Sincerely and Elliwiny that somehow never got caught (we’re gonna fix it for print).

Kyan has a subdermal implant behind her ear that passively transmits her voice to the security terminal. She can tap it to page Nathan and Rex.