I just read the manual an I am not sure it does. The manual says nothing about that. My clock does the same when power fails. Comes back to correct time when power returns. I miss that on my older clock. Display never went out even during power outage. You can call Phillips an ask or email. It is on there site.
The clock and alarm memory will
be retained during a power
interruption. During battery
backup operation, the display
will not light up, but the correct
time will be maintained internally
The mains transformer inside it will be of 10.2vAC secondary to 120VAC primary. OK.
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