According to True Pundit NYPD sources confirmed Hillary was wearing an earpiece during NBC's LIVE town hall:
"NYPD sources involved with the NBC forum’s security detail confirm Clinton was wearing an ‘inductive earpiece,” the same technology employed by almost all lead Broadway actors to receive forgotten lines and stealth off-stage cues from directors. The flesh-colored earbud is easily concealed. There are no wires running directly to the ear like you see with the units employed by Secret Service protection detail personnel."
This would not be the first time Hillary Clinton has been accused of wearing a concealed earpiece. WikiLeaks released an email to Hillary Clinton dated September 24, 2009 from top aide Huma Abedin that asked: "Did u take your earpiece or do I need to get it?"