What does DUPLEX button stand for?
Duplex button has 2 modes: ON and OFF, used to activate or inactivate the sound output from micro on the speaking end of line. When the Duplex is ON, both you and the one at the other end can hear your changed voice output. However, when Duplex button is OFF, only the party at the other end can hear your changed voice. Note: Duplex button is in “OFF” status as default when you use VCS with an audio player as Windows Media Player, Winamp, Jet-Audio, RealOne, etc.
