Blaupunkt BREMEN RCM 127 Operating Instructions Manual page 13

Optical indication of anti-theft protection
Flashing KeyCard tongue
When the radio has been switched off and the KeyCard removed, the KeyCard
tongue can be programmed to flash as a warning to thieves.
The following requirements must be fulfilled for this to function correctly:
The positive power supply line and the permanent +12 V lead must be connected
properly, as described in the installation instructions.
In the DSC mode, the LED setting must be switched to "LED ON".
If necessary, please refer to the section on "Programming with DSC – VARIOUS,
KC LED".
Switching off the flashing light
The flashing light can be switched off by pushing in the KeyCard tongue to lock it.
Before inserting the KeyCard, make sure that the KeyCard tongue is in the out
position.
If you would like to deactivate the flashing tongue permanently, switch the LED
setting to "LED OFF" in the DSC menu.
For further information, read the section on "Programming with DSC – VARIOUS,
KC LED".
Taking care of your KeyCard
In order to ensure that the KeyCard always functions correctly, it is important for
the contacts to be free from any foreign particles. Avoid direct skin contact.
If necessary, clean the KeyCard contacts using a cotton swab dipped in alcohol.
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