Accu-Chek performa Owner's Booklet page 41

4. Press and release
or to select
"On" or "OFF". Press
and release to set your
choice.
5. I f you select "On", the
hour flashes. "A-1" and
the bell symbol remain on
the display.
6. Press and release
or to select the
hour. Press and release
to set the hour.
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