  An induction loop system allows audio to be “transmitted” to a listener by means of a magnetic field. It is "wireless" but there is no radio signal.
Induction loop earpieces are listen only devices and they will not pair with a Bluetooth device.
A neck loop is plugged into the audio output of a walkie talkie, MP3 player, iPoD etc. The current flowing in the neck loop produces a magnetic field which varies according to the audio signal from the device it is plugged into.
The covert earpiece contains a coil which converts the magnetic field back to audio and feeds it to a miniature sound amplifier. To hold a 2 -way conversation a separate microphone and talk switch (PTT) is required as found in our TC4 and Olympia covert headsets listed below.
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