SIGMA PC 25.10 - Manual (Page 23)

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7.1 inForMation on heart rate
personal zone:
The limits of the training zone can also be changed manually.
Notes about settings can be found in Chapter 3.1 “User settings”.
Please always note that general exercise can never address
personal issues! Therefore really ideal training can only be
designed by a well educated trainer who personally knows
the athlete.
what happens if i remove the chest belt during training?
The watch will no longer display a signal, the screen will indicate
“0” – after a short period of time the PC 25.10 goes into sleep
mode (stopwatch does not operate).
do SigMa heart rate monitors switch off completely?
No – in sleep mode only the time and date are displayed so you
can use the heart rate monitor as a normal watch. In this state
the PC 25.10 uses only very little power.
7.2 FaQ