Midland GXT500 ,GXT550, GXT565 Owner's Manual page 10

Model GXT500/550/565 Series
®
CALL TONE
Your GXT500/550/565 Series can transmit a call tone for a fixed
length of time. To send a call tone, press the CALL button. The TX
icon will appear while transmitting a call tone and a tone can be heard
on the speaker for confirmation.
KEYPAD LOCK
To avoid accidentally changing the radio setting, press the LOCK
button for 4 seconds. The KEY LOCK icon will appear on the display.
PTT and CALL will still be active. Repeat the same procedure to
unlock the keypad.
DISPLAY ILLUMINATION
During Power on, the display illumination will activate for approx. 7
seconds. The display illumination can also be activated when the
MENU button is pressed.
CHANNEL SELECTION (GMRS/FRS BAND)
/
Press the MENU button once, and then the buttons to select one
of the 22 GMRS/FRS channels. To confirm the selection, press the
PTT button or press the MENU button again to move to the next
feature setting.
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