The Talk button activates the headset and can operate in either Hands-Free-Talk or Push-to-Talk Mode.
Channel Button and Indicators
On the BP-2002 only. Allows the user to select which intercom channel is active. A yellow indicator light shows the active channel.
The sidetone control adjusts your own voice level heard in the headphone.
Call Button and Indicator
The call function allows the user to send or receive signals to other user stations on the intercom channel. The user can receive call light signals as well as send signals easily.