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. If 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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