Brother P-touch 550 - Manual (Page 60)

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batteries have been installed or the machine has been plugged in using the optional AC
adaptor, the previous session’s information is displayed when the machine is turned on. This
feature allows you to stop work on a label, turn off the machine, and return to it later without
having to re-enter the text.
+
When changing the batteries, be sure to insert the new ones within five minutes of
removing the old batteries, otherwise the text shown in the display and any text files
stored in the memory will be lost (unless the machine is plugged into an AC outlet with
the AC adaptor.
If the adaptor is removed from the AC outlet before unplugging it from the machine,
the text files in the memory will not be deleted if batteries are correctly installed.
The machine will automatically turn off if no key is pressed within 5 minutes. The machine’s
Internal memory stores the current session’s information and displays it when you turn on the
machine again.