Audiovox GMRS600SLK - Manual (Page 10)

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Adjusting the Volume (13, 15)
With the unit powered on, press the Up Channel/Volume button (F) to
increase volume and the Down Channel/Volume button (G) to decrease
volume. The display will indicate the current volume level between 0 to 7
bars on the right lower side of the LCD.
Monitor/Display Backlight Button (14)
This button is used to check activity on the current frequency before
transmitting. Check activity by pressing the Monitor (M) Button longer
than 2 seconds; the
icon will appear on the display and you will hear
static if frequency is clear. Do not transmit if you hear conversation.
Hold down the Monitor Button again longer than 2 seconds and the
icon will disappear from the display.
The monitor function will temporarily bypass the squelch setting and play
all signals on a given channel. This feature is useful when communicating
with other parties at extreme range.
By pressing the monitor button momentarily, the LCD backlight is turned
on accompanied by a beep tone (if enabled); the LCD backlight will turn
off automatically in about 5 seconds, or when the monitor button is pressed
momentarily once again.
Push To Talk (PTT) Button (3)
Pressing and holding this button will allow you to speak to any transceiver
that is set to the same channel and privacy code setting as yours. Hold
the transceiver approximately 1 to 2 inches from your face as you speak
into the built in microphone (7). After you have finished speaking, release
the PTT Button to allow reception of incoming signals. It is not possible to
transmit and receive at the same time. The Transmit Signal Level indica-
tor ( ) will display the relative strength of the transmitted signal. When
receiving an incoming signal, the ( ) icon will appear in the upper right
quadrant of the display. The PTT button can also be used as a two-way
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