Mitsubishi Electric MRCH1 Manuel D'utilisation page 31

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Battery replacement (Portable Central Controller)
Install fresh batteries when the "REPLACE
BATTERY" warning begins flashing. The
warning flashes about two months before the
batteries are depleted.
Remove the battery cover and install 3 fresh
AA alkaline batteries.
After batteries are installed, the Portable
Central Controller will automatically restore
communication with the wireless network
within a few minutes.
M28475
29 69-2427EFS—01