SIGMA ONYX BALANCE - Manual (Page 38)

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5.2 FAq
Frequently asked questions and service
What happens if I remove the chest belt during training?
The watch will no longer pick up a signal, the screen will indicate
“0”. If the stopwatch is not running, the ONYX BALANCE goes into
sleep mode after a short time.
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 ONYX BALANCE uses only very little power.
Why does the display react slowly or turn to a black colour?
The operating temperature may be too high or low. Your heart
rate monitor is designed for temperatures between 0° C and 55°C.
What should I do if the screen display is weak?
A weak display may be due to weak batteries. You should change
them as quickly as possible – battery type CR 2032
(Item No. 00342)