Standard Horizon QUANTUM GX6500E Owner's Manual page 177

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Display
222 by 162 pixels full dot matrix display.
Soft keys
These three programmable keys can be customized through the setup
menu mode. When pressing one of these keys briefly, the key functions
will appear at the bottom of the display. Refer to section "19.2 RAM4 SOFT
KEY ASSIGNMENT" for details.
Strobe Light
When the [STROBE] soft key is pressed, the internationally-recognized
Morse Code "S.O.S" message will light and flash repeatedly.
From MENU → SETUP → CONFIGURATION → STROBE LED, you can
select one option from "CONTINUOUS", "SOS", "BLINK 1", "BLINK 2" and
"BLINK 3".
16/S key
Pressing this key immediately recalls channel 16 from any channel loca-
tion. Holding down this key recalls the SUB channel (The default setting is
channel 9). Pressing this key again reverts to the previous selected working
channel.
Speaker
The internal speaker is located here.
DATA jack
Use the micro USB type B jack for SSM-70H (RAM4) firmware update.
DISTRESS key
This key is used to send a DSC distress call. Refer to section "10 DIGITAL
SELECTIVE CALLING (DSC)".
GX6500E/GX6000E Page 177