Audiovox GMRS1100-2CH - Manual (Page 10)

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The PTT Button can also be used as a two-way call ringer. Pressing the
button twice quickly will call another party on the same channel. The transmit
LED will light red for approximately 3 seconds and then go out.
Up Channel/Volume Button (16)
In the standby mode, pressing this button will increment the listening
volume. When in function edit mode this button will be used to adjust the
unit’s settings.
Down Channel/Volume Button (13)
In the standby mode, pressing this button will decrement the listening
volume. When in function edit mode this button will be used to adjust the
unit’s settings.
Function (F) Button (14)
This button is used to select various feature settings in the GMRS and FRS
modes.
Emergency (EMG) Call Button (10)
This radio has a quick access button (EMG) to the Emergency and
Assistance Channel. This channel is not monitored by local authorities.
When using this channel, EMG appears on the display. Pressing this button
will set the transceiver to channel 20 (462.6750 MHz).
External Speaker (SPK) and Microphone (MIC)/CHG Jacks (6)
This set of jacks accepts both an Audiovox headset/microphone connector
(optional) and the supplied wall charging adapter. For additional optional
equipment and accessories for the GMRS1100-2CH, visit the Audiovox
web site at www.audiovox.com.
Scan/Lock Button (11)
Press this Button momentarily to enable or disable the scan mode. Press
and hold the button for more than 1 second to lock or unlock the key pad. All
buttons will be locked in the lock mode except PTT and Monitor (M). When
the keypad is locked, the (
) icon will display in the top left corner.