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Knowledge document #3523
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Behavior of FRITZ!DECT 500 in case of power or internet failure

If the FRITZ!Box does not have any power, all of the settings of the LED light FRITZ!DECT 500 for brightness and color remain intact. The LED light remains on or off, depending on its state at the time when the FRITZ!Box lost power. Automatic switching of the LED light, for example in the case of switching schedules, will not function.
As soon as power is restored to the FRITZ!Box, it will once again be switched automatically. If you configured a specific switching state for the LED light after power failures in the user interface of your FRITZ!Box on the "Light setting" tab in the menu "Smart Home > Device Management", this is the state that is enabled after a restart.
If there is an internet failure, the LED light can still be switched within the home network.