Accu-Chek performa Owner's Booklet page 46

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5. If you select the hypo
alarm "On", "set-up",
and flash. The display
shows 3.9 mmol/L.
This function is no substitute for hypoglycemia training by your healthcare
professional.
6. Press and release or
to select the level you
want. Press and release
to set it.
7. Press and hold until
you see the flashing test
strip symbol to exit the
set-up mode.