Oceanic OL-BKY20-A010B2 Guide D'utilisation page 60

1. Open the rear cover of the remote controller
2. Use two 1.5V AAA batteries (batteries not provided)
3. Install the batteries.
4. Close the rear cover of the remote controller and start using it!
Warning:
If you do not use the remote controller for a long time, remove the battery from
the remote controller.
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