switel BCC2020 Manuel D'utilisation page 10

Setting Up
Battery Operation
The Baby Unit also works on battery power,
so that you can use it even when you are
not near to a mains power socket or during
a power cut.
1. Remove the battery compartment cover and insert 4 x AA Alkaline batteries
into the battery compartment on the Baby Unit and replace the battery
compartment cover.
2. The Power Indicator LED should light.
Note1:
the recommended batteries are 4 x AA Alkaline
2:
the Baby Unit will only work from the batteries if the mains power is
disconnected.
3:
Battery low: The power indicator LED on Baby Unit blinks and the link indicator LED
4:
Please power off the Baby Unit before removing the main power or the batteries.

OK
on Parent Unit blinks red.
OR