HearLink is a Bluetooth® transmitter that connects directly to the sound output on most standard television sets and other audio devices. HearLink sends the audio directly from the TV to the paired BeHear® NOW headset. This way, all the other noises in the room do not interfere with listening to the tv (or other audio device).
Watch this video to see some tips for troubleshooting HearLink.

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a. Unboxing HearLink Assistive Listening Transmitter
HearLink is a Bluetooth® transmitter that connects directly to the sound output on most standard television sets and other audio devices. ...
b. Operating the HearLink Assistive Listening Transmitter
HearLink is a Bluetooth® transmitter that connects directly to the sound output on most standard television sets and other audio devices. ...