SIGMA SPORT TOPLINE ONYX PRO Mode D'emploi page 60

2.4 MEASURING THE HEARTBEAT
Synchronisation of Watch and Chestbelt
Your ONYX PRO is equipped with a digitally coded chest belt that
enables you to have fault-free training.
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You can enter another word with up to
8 characters under the ONYX PRO font
(my name function). Please refer to
Chapter 3.2 "Setting unit".
To activate your ONYX PRO hold down any
button for two seconds. The clock changes to
active mode and you enter the training main
menu.
Note: At the start always refer to the tree
diagram shown in 2.1
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