SIGMA ONYX PRO - Manual (Page 60)

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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.
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
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”.