The Otto Engineering V1-10610 Wireless Ear Receiver Kit is an in-ear IFB or surveillance monitoring earphone kit that secures in the right ear canal, and is equipped with a neck loop-style inductor, which creates the inductive field that transmits the remote radio's sound to the wireless ear receiver.
The V1-10610 is a standard in-ear induction receiver for use with flat pack or neck loop inductors. The advantage of these types of systems is that they remain discreet, due to the fact that no wires travel directly to the ear.
PSC Inductive Neck Loop - For Inductive Earpiece
This professional IFB cueing utility is basically a small, flexible neck loop which couples audio via a low level magnetic field into a hearing aid style inductive earpiece. This allows talent to almost invisibly receive a discrete cue while on camera.