Sony ICD-ST25 Digital Voice Editor 2 Operating Instructions Manual page 16

Recording Messages (continued)
Memory remain indication
During recording, the remaining memory indicator decreases one by one.
When the remaining recording time reaches 5 minutes, the remaining
memory indication flashes.
When the remaining time reaches 1 minute, the remaining time indication
will flash in the display window regardless of the display mode (page 27).
When the memory is full, recording automatically stops and "FULL" will
be displayed with an alarm sound. To continue recording, first erase some
of the messages (page 37).
Note
When you set the BEEP (page 55) to OFF, an alarm sound (beep) does not
sound.
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