Clear-Com BS850 (Last time buy) - Manual (Page 35)

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Beltpac Buttons A and B Setup:
You can change the functions of Beltpac A and B buttons from the Configure tab>Edit Beltpac
Button and LED Configuration
box>Beltpac>Buttons/LED path>Primary Buttons section as
shown below:
From the Primary Buttons section, you can select the Beltpac Mode (Disabled, Momentary or Lock)
and function for Buttons A and B on each Beltpac.
Ch1 = Talk, Channel 1
Ch2 = Talk, Channel 2
Curr = Talk, Current Channel selected
Both = Talk, both Channels 1 and 2 *
ISO1 = Talk, to Beltpacs receiving only Tx1 *
ISO2 = Talk, to Beltpacs receiving only Tx2 *
ISO = Talk, to Beltpacs receiving both Tx1 and Tx2
Page = Talk, Page (stage announce)
Aux = Talk, Auxiliary Out
* Valid only for dual-receiver Beltpacs.