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Auxiliary features
Key lock
The key lock feature allows to disable the UP, DOWN and MENU keys so that
settings can not be modified accidentally.
1. To activate the key lock feature, press and hold the MENU key until
“” appears on the LCD screen.
2. To deactivate the key lock feature, press and hold the MENU key until
“” disappears on the LCD screen.
Note The PTT and POWER keys remains functional even if the key lock feature
is activated.
LCD Screen backlight
Every time a key is pressed (except PTT and CALL), the LCD screen backlight will
illuminate for 5 seconds.
Microphone/Earphone/Charge Jack
The TwinTop 400/400-L is equipped with an auxiliary microphone, earphone, and
charge jack located at the opposite side of the PTT key.