Watts BT-DPRF-02 Guide D'utilisation page 27

In order to enter in the menu, press on the escape key
during 10 seconds, the following display with the first parameter
appears:
- Once you entered in the menu, go to the parameter you want
to change by using the keys (◄) or (►).
- Use the keys (+) or (-) to edit and modify and confirm by
pushing the (OK) key.
- To leave the parameter menu, go to the parameter "End" and
press the (OK) key.
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