JBL Under Armour Sport Wireless Train Guide De Démarrage Rapide page 7

SPORT WIRELESS TRAIN
Quick Start Guide
Guide de démarrage rapide
7. TALKTHRU
Short press once to activate TalkThru, which allows you to clearly hear
others for quick conversations, without removing your headphones.
You will hear your music volume level lower when TalkThru Technology
is engaged.
8. WIRED LISTENING MODE
Note: TalkThru does not function when using cable connection
x1 TalkThru