SIGMA SPORT TOPLINE ONYX FIT Mode D'emploi page 64

7.2 FAQ
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 FIT uses only very little power.
Why does the display react slowly or is coloured black?
The operating temperature may be too high or low. Your heart
rate monitor is designed for temperatures between 0 °C and
55 °C (32–140 degrees F).
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)
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