Accu-Chek Performa Nano Owner's Booklet page 44

When you are setting the time for the alarm clock function, the bell symbol and
"set-up" remain on the display.
42
1. Press and release
turn the meter on. The
flashing test strip symbol
appears.
to 2. Press and hold
"set-up" appears on the
display.
until 3. Press and release
repeatedly until you
reach the display with
the bell symbol, "OFF,"
"set-up," and the
flashing "A-1."