Arjohuntleigh Enterprise 9600X Notice D'utilisation page 34

If a warning tone (beep) sounds when pressing a button, this
indicates that the bed is operating on the backup battery - refer to
the section "Backup battery" on page 34.
If a button is held down for more than 90 seconds, the function will
be automatically inhibited until the button is released. The function
must then be unlocked as described in the section "Function
lockout" on page 33.
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