Becker Centronic EasyControl EC242-II Notice De Montage Et D'utilisation page 27

Channel indicator lights
A radio signal is indicated by the illumination of the corresponding channel indicator
light.
If the battery power decreases, the respective channel indicator light flashes during
transmission.
Decreased battery power will result in reduced transmitter power or operating range. If
the channel indicator light no longer illuminates when a button is pressed, the battery
needs to be replaced.
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